From the last episode of TSCC. The creators of D&D influenced so many things it's kind of scary when you think about it.
"Hello, Ms. Weaver. I just delivered a crit hit to the umber hulk." - John Henry
The whole clip which is a nice little tribute to D&D can be found
here. Just skip ahead four minutes and thirty seconds into the show. Keep it on until about seven minutes in for another funny bit.