''Product Recall'' (Season 3, Episode 20)
Question. Which Dwight is best: Dwight Schrute or Dwight Halpert? While it's less of a prank and more of a direct insult, Jim's impersonation of Dwight is too memorable, and dead-on, to leave out of our Office prank countdown. With a pair of $4 drugstore glasses, a tie from the Salvation Army, a calculator watch, and an unfortunate hair part, you too can become a Dwight look-alike! To be even more convincing as a Schrute, be sure to ask a series of nonsensical questions.

Dwight's revenge: A messy hairstyle, a few goofy smirks, and some unabashed flirting with Pam (in other words, an equally hilarious impersonation of Jim). —Gretchen Hansen