A: I didn't do it on porpoise.
They both watch whales.
A whale with a table taped to it.
Someone bumped his elbow while he was brushing his teeth.
200 ft: Aaaaaaaaa, bump 2 ft: Bump, aaaaaaaaa (Yes, it's an old, really old joke. Surprisingly haven't seen it here, yet.)
He whale-d
Because it had no porpoise in life.
What is life without a porpoise?"
Because he had no porpoise.