Jon Stewart may host The Daily Show on Monday, but on every other day of the week he apparently works part-time to make ends meet.
Thursdays he's a delivery driver, which just so happens to result in him being onstage to deliver a sandwich and some margaritas to Jimmy Kimmel Live! 2IC Guillermo partway through Jimmy Kimmel's monologue.
The end result is an amusing exchange which features two cheek slaps for Kimmel, some unexpected improv from Guillermo, and Stewart deciding to sit on a random audience member so he can stay to watch the rest of the show.