Puzzle - how to ensure you get the quarter, not the penny

From our friends at Futility Closet:

Here are a penny and a quarter. Make a statement. If your statement is true, then Ill give you one of these coins (not saying which). But if your statement is false, then I wont give you either coin.

Raymond Smullyan says, There is a statement you can make such that I would have no choice but to give you the quarter (assuming I keep my word). What statement will accomplish that?

Answer is here. Read the rest