Another penguin one (more apt to the thread title):
Penguin walks into a bar, says to the barman 'Have you seen my father?'
Barman says 'what does he look like?'
Did you hear about the mathematician with constipation?
He worked it out with a pencil!
How many Alzheimer's patients dose it take to change a lightbulb
To get to the other side.
I never know what to say after sex.
I feel 'thank you' is too much and 'sorry' is never enough.