I love this kind of stuff.
The funniest thing I ever saw on television was the Candid Camera episode where a guy went into Horn and Hardart. He put in his coin in the vending machine, and when he went to pull out a donought, the Candid Camera people, had the donought tied to a string, and pulled it back into the vending machine.
The surprised look on his face, had me laughing so hard. It was priceless.
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"It doesn't cost "nuttin", to be nice". 
MOM
I just want to do the right thing! Uncle Joe, (my hero).