Because he was playing "This little Piggy" with his baby brother!
Because every time he puts up a prayer it gets answered. (I thought of this myself, but it is so corny, it could easily be in every damn joke book.)
Too many cheetahs
He wasn't ready for a Kermitment.
Because every time they get to 69, Miss Piggy gets a frog in her throat.
A centipede with a wooden leg!
Not enough leg room!