Magic with familiar objects- and everybody likes to watch magic done with money!
Imagine borrowing a dollar bill, an ordinary dollar bill. Then create an unforgettable illusion- make a pencil poke right through the bill, with the pointed end of the pencil visibly through the bill. Now the incredible part- the pencil is then ripped to the edge of the bill- there is a very audible tearing sound! Yet when the pencil is removed from the bill- there is no hole! A jaw-dropping trick you can do with their own bill!
By the way, this trick works with ANY piece of paper, as well as paper money.