Terre Haute City Police say that you need to be on the lookout for funny money.
There have been 11 reported incidents of counterfeit money in the area.
Most of the cases involve 20 and 100 dollar bills.
Officials try to catch the fake bills but some do get through and if you get one then you are out.
If you decide to try to pass it on so you aren’t out the money you could go to jail.
Today’s bills have lots of built in security features to try to help you detect bad bills but older bills don’t have some of those new features.
For help in detecting a bad bill, follow the link to the U.S. Secret Service website.