Just about every dramatic series has its funny moments. But every so often, the writers decide to lighten up a bit, and write an entire comedic episode. Usually, this works best when the show has been on for a while, and we're comfortable enough with the characters that we can fully appreciate seeing them in unfamiliar, humorous situations.
In my opinion, the most iconic of these comedic episodes is Star Trek's "The Trouble With Tribbles." (Shatner is uncharacteristically restrained as the beleaguered captain and Nimoy's deadpan delivery is spot on.)
I could list some others — but we want to hear from you. What are some of your all-time favorite comedy episodes of drama series? Please include pictures, video and links!