"I like libraries. I was in the one in New York. The guy was really rude... I said 'I'd like a card', he said 'you have to prove you're a citizen of New York.'
So I stabbed him."
---Emo Phillips
Letterman did a joke along this line that failed so he repeated it several times that week. The joke was:
"It's the Chinese New Year so, last night, there were lots of fireworks going off. Mother's calmed their children by telling them it's only gunfire."