Linking Paper Clips Trick
Challenge: Bet your friends that you can link two paperclips together without touching them.

The trick can be performed almost anywhere as all you need to perform it are a money bill and two paperclips.
You will find many simple magic tricks on this site, a lot of them requiring just a few easily found items. This just goes to show that you don't always need expensive props and countless hours of practice to perform a view easy and entertaining tricks for your friends.