Whether you're a rare coin collector or not, it's always good to keep an eye on your change.
That's because that money in your pocket could be worth something big one day.
The Girl Guide 50p came out in 2010 to celebrate 100 years of the Girl Guiding movement.
It has a whopping 7.4 million in circulation so it's not considered rare among collectors.
But that doesn't matter considering it sold for hundred times more than its face value on eBay.
The coin managed to trade for £400 when it was recently posted on the website.
Have you ever earned yourself a lot of money from your rare coins? Tell us in the comments below…
In the description, it said: "Rare 50p coin – Girls Guidance 2010 – Royal Mint Error Coin."
A normal version of the 50p can be picked up for around £4 because there are millions in circulation.
However, other money, like the rare Kew Gardens coin, could be worth more.
Previously, the piece of change sold for an absolute fortune on eBay.
The coin, believed to be one of the most popular in the UK, was flogged for £200 online.
It attracted more than 27 bids over the course of a week before it went for 400 times its face value online.
The coin was minted to mark the 250th anniversary of Kew Gardens with around 210,000 in circulation.
It first entered circulation back in 2009 which comes with the Kew Gardens Pagoda stamped on the front.
According to the money experts at ChangeChecker, the coin is the most valuable 50p.
With just 210,000 minted compared to a standard of around five million, this coin is classed as very valuable.
And The Royal Mint says around one in every 300 households in the UK could have one in their pockets.
Depending on the condition, coin collectors are looking at anything between £30 and £190.
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