Duff, John and his Fiance break into Homespital to steal her fathers cash. Once inside they tell Duff to break a window to make it look like someone else broke in. Tom Green's character, Duff, starts throwing walking chairs and stuff at the glass window. He's hurling them at the glass. You start to see cracks appearing in the glass and the scene cuts away.

Then they come back to Duff still trying to break the glass, and he gets into a motorized wheel chair. If you look again... the glass is perfectly brand new. NO MORE CRACKS!