Don't get me too excited because I use four letter words when I get excited.
I'd just like to say to the parents, your children are safe, your country is safe, the FCC has taught me a lesson and the only four letter word I'm going to use today is P-E-N-N. Come to think of it 'Bono' is a four-letter word. The whole business of obscenity — I don't think there's anything certainly more unseemly than the sight of a rock star in academic robes. It's a bit like when people put their King Charles spaniels in little tartan sweats and hats. It's not natural, and it doesn't make the dog any smarter.

PENN Address (2004)