Because doing so would be incense-itive!
A. Reading the waffle iron
3, duh. (My ex's 9 year old little sister told me this joke, and followed is up with: "and YOU'RE the math guy!" >< Burned.)
Reintarnation.
Nothing wrapped in Emptiness. How did the birthday child respond? You are thoughtless for giving me this meaningless gift. To which the Buddhist Master replied, "Thank you."