From things shoved in places they don't belong to horrific injuries that sound like the stuff of nightmares, there really are no boundaries.
Doctors, nurses and other medical professionals have shared their weirdest cases on a Reddit thread and the answers will shock you.
Ever wondered if you can sneeze so hard your intestines fall out? Turns out you can.
Or have you ever wondered if a penis can break?
Here's the weirdest cases shared on the thread…
1. GI Joe-oh-oh
We all know how big a GI Joe action figure is… now picture that in a man's urethra.
Yep, we thought you'd be wincing.
TalaxianNeckBeard shared their list of "things I've seen shoved in urethras while working the ER".
It included three ballpoint pens, marbles and GI Joe action figure.
2. Ouch-choo
When you have a hernia you should see a doctor, for a good reason.
"My mum told me a story about how this dude had a ruptured hernia that he'd ignored for a while, and then sneezed one day and his intestines flopped out of his body," MothMonsterMan300 said.
"Like out onto the floor. So his wife scooped em up in a towel and he held the towel while they drove there.
"My mom heard that bit, but told me she near s*** herself when this dude came walking in holding a bloody towel and his wife yelled 'my husbands guts fell out'."
3. Bitten by what?
They may be extinct, but that didn't stop one person suffering a sabre tooth cat bite.
Sanglewang shared: "Sabre tooth cat (smilodon) bite. Local university has a palaeontology dig with Pliocene (IIRC) era fossils.
"An undergraduate was helping out in lab and tripped and fell into a fossil reconstruction, lacerating her forearm. Needed a few stitches."
4. Snap, crackle, pop
Broken penises are far more common than you might think.
When a man's member fills with blood it becomes hard and if you hit it at the wrong angle it can cause the tubes that fill with blood to rupture.
"A lady was riding him, she came up too high, and then down his erect penis," Dancino said.
"He heard it pop. It had a slight bend to it and blood was coming out of the tip. It bled so much that the walls were covered with blood.
"He had to hold pressure to stop the blood from coming out.
"He found humour in the situation telling us 'my hand is starting to get tired, can you hold my penis now?'."
5. Bulking stupid
If you want to bulk up, you need to do it through diet and exercise…not what this guy did.
"We had a call for incision and drainage of bilateral deltoid abscesses," Med_school_slacker wrote.
"He apparently had thoughts of being a body builder, but instead of lifting weights or knowing someone who could hook him up with some quality steroids, he decided to bulk up by using some protein powder and mixing it with water, drawing it up into a syringe, and injecting 20-40cc daily directly into the muscle.
"If bulk was what he was going for, it definitely worked, temporarily.
"A rip-roaring localised infection makes you look plenty swollen. They got almost a litre of pus mixed with liquefied protein powder out of each deltoid."
6. Bubble and squeak
When it comes to enemas, it's best to leave it to the doctors.
"I'm A registered nurse, had a dude come in with a travel sized shampoo bottle stuck up his a***," Atomic_Thomas89 said.
"Said he was trying to give himself a soapsuds enema and it got lodged up too far and he couldn't get it out.
"He went for surgery within the hour. I don't know if I can believe his story."
7. Herbal remedy
Ladies, if you notice anything wrong with your downstairs area then it's best to see a doctor.
"A lady was trying to naturally treat bacterial vaginosis and heard that garlic worked," Letmetellyouwhat wrote.
"So she put a clove of garlic in her vagina and it got stuck. She tried to use a plastic spoon to get it out but couldn’t get it.
"Had to come in to get it out but we couldn’t find it. We assumed it fell out on the ride to the hospital."
As a rule, and you shouldn't forget this, you should never stick anything in your vagina unless it's been specifically designed for that purpose.
If not you could upset the natural levels of bacteria down there and cause a nasty infection.
8. Eye opening
This one isn't for the faint-hearted.
Princess_Honey_Bunny shared: "16yr old kid was out fishing and drinking, slipped and fell while holding his pole straight up, handle on the ground.
"The pole went straight in through his eye and into his brain, he then proceeded to pull the pole out which shredded his eye and took some brain with it, which led to a few seizures and brain surgery.
"He lost his eye and almost all control of his left side.
"He was recovering well though, control of his limbs was slowly coming back and will be almost normal within a year."
9. Nailed it…?
You've got to be in some kind of shock to do this to yourself.
"Guy cut off his hand with a circular saw," pamedic555 said.
"The weird part was he then used his other hand to use the nail gun to fire two nails through his skull.
"He thought it would stop the pain from cutting off his hand."
10. Sore head
Next time you bump your head remember to keep the wound clean.
"Had a fellow with dreadlocks come in complaining that his head hurt, so we go to take a look where he says it is hurting and one of the dreadlocks just falls off and a ridiculous number of maggots just start pouring out of his head," Mandorism wrote.
"Apparently he bumped his head like two months earlier and thought it wasn't a big deal and it had been festering under there the whole time."
11. Sealed with love
If this guy hadn't seen the scans himself it almost wouldn't be believable.
"I saw the CT scans myself so I know it's a real story, otherwise I wouldn't have believed it," so-very-awesome said.
"An artist wanted to give his boyfriend a personalised token of love by getting a plaster cast of his anus.
"Ended up pouring the plaster into his rectal cavity and, as it expanded, it ended up completely sealing it off.
"Dude was too ashamed to go see a doctor and let it fester for a couple of days until the bloating made him come clean to his boyfriend.
"The boyfriend wanted to help so he took a drill to make a hole in the plaster. The drill got stuck. At that point they thankfully decided to seek professional help."
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