COTD Part XVIII: For Science!!
The Skating Gnu: Daddy, I need your help with a science experiment.
Me: Okay, what's the experiment?
TSG: (Reads assignment) Prove that you are matter.
Me: *poke* *poke* *poke* *poke* *poke* *poke* (you get the point)
TSG: Ow! Ow! Ow! Ow! STOP IT!!!!
Me: Quod Erat Demonstratum! I've proved you are matter, and as a bonus you are madder!