You could you be sitting on a small fortune after nipping out to buy your essentials.
Some very rare coins could be found just about anywhere, and some are worth a huge amount.
Jon White, who runs the Britannia Coin Company, has shared some of the rarest older coins out there – and how much they could fetch if you come across one.
It's not just about checking your change after you have been to the shops, reports TheSun.
If you are a bit of a collector you could have some knocking about, and not know you are sitting on a gold mine!
Many will be keeping their eyes peeled for one in particular, which could fetch a jaw-dropping £25,000.
Here's the coins you must look out for when you next rummage around.
London Mint Sovereign – £25,000
This golden goodie from 1917 is worth up to £25,000.
If you have some old coins knocking around the house, it's worth a looking just in case.
It's one of the rarest coins around and they are wanted by collectors.
Over 100 years ago, the US Treasury then melted them all down – so precious few are thought to still be in existence.
Sovereign set – £12,000
In you have all four, you could really "coin" it in.
The set was produced to mark the coronation of George VI and not many were ever made.
Just over 5,000 were minted, which means they are in very high demand.
If you have them in your loft, they could fetch between £8,000 and £12,000.
The collection is made up of the £5 Crown, double sovereign, full sovereign and half sovereign.
Gothic Crown – £5,000
The 1847 coin is worth a small fortune more than 150 years on.
The silver beauty is extremely collectable and needless to say they are still in high demand.
Just 8,000 of these rare Gothic crowns were made.
The coin features an image of Queen Victoria, portrayed in a medieval dress – and it has gothic text on the other side.
KN Penny – £1,000
This 1919 penny is worth quite a few pounds!
Even though over five million were minted, they still have a high value.
The Kings Norton coins has the letters K and N, so you can't miss it.
But the value is depending on the condition of the coin, and the sums can really vary.
The "Raised Edge" Proof Crown – £600
If you can find this coin, it could be worth up to £600.
It was the first ever commemorative crown, and it marked King George V's Silver Jubilee in 1935.
The lettering 'DECUS ET TUTAMEN ANNO REGNI XXV' is stamped into the rim, which comes outwards.
Experts are on record saying these coins could sell for between £500 and £600, depending on condition of course.
The Wreath Crown – £300
Less than 10,000 Wreath Crowns were ever produced.
It has a fantastic design, and could fetch £300 if it looks the part.
The back of the coin features a large crown with a wreath of shamrock leaves with thistles and roses intertwined.
The sterling silver coins was made in 1928.
Sixpence – £10
Back in 1952, our classic sixpences were all shipped to Jamaica.
That makes the them very hard to come across in the UK – but it doesn't see their value shoot up, sadly.
You can usually get around £10 for every one you find online.
However, some in great condition have fetched £30 before on eBay.
One side features King George VI, while the other shows his initials.
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