Regular or decaf?

A man walked into a restaurant and seated himself. Soon, the waitress came over to take his order. ". . .and to drink?" she asked. The man said he would like coffee.

The waitress promptly returned with a cup of coffee, but spilled it on the man's lap when she stopped at the table. "Oh my God! I am so sorry!"

"That's OK," the man said, sopping up the puddle on his pants with his a napkin. "But tell me, is this regular or decaf?"

"Regular," she replied.

"Oh great ... now this thing is going to be up all night!"