This is pretty self explanitory, but basically you will be squirting soem tooth paste into the middle of the oreos.
OMG, I love this one. Okay, so cut out a skirt shape with black paper and tape or glue it on the mens room. They don't have this, but you could use white out on the girls bathroom so that it looks like the mens room.
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For this one, all you have to do is cut out the shape of a bug and you can glue or tape it on the inside of a lamp or something.
Caramel onions anyone? Just like caramel apples, melt some caramel and cover the onion with the caramel.
Put some water in a cup and freeze it. Then when it is completely frozen, put it on the kitchen counter, flipping it so that the water would slip onto the counter if you lift it up. Leave it there so that it will melt. Then when somebody has to eventually clean it up, it will go onto the ground and freeze your toes!