Water

Water, taken in moderation, cannot hurt anybody. 

~ Mark Twain 

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Today is my dad's birthday.  He used to play pranks on us when we were children.  One time he gave my brother Erik a penny and put a funnel in the waistband of Erik's jeans.  Dad said if Erik could roll the penny off his nose and into the funnel, he'd get a dollar.

Erik leaned back to put the penny on his nose and as he was rolling it down to the funnel, my dad through a glass of water in the funnel which then made the water go into Erik's pants.

Everyone except Erik thought it was funny.  In retrospect, it was also a very smart trick because Erik's pants soaked up the water so it didn't spill on the floor.