The fist bump is everywhere this week… I would like to nominate it for having the Best Week Ever on “Best Week Ever“. Obama and wife locked up a fist bump after securing the Democratic nomination earlier this week, and just last night David Letterman gave props to Julia Roberts in the form of a fist bump during the “Late Show“.

Upon examining the rules of fist bumping and applying them to the situation, it’s hard to tell if this was a acceptable fist bumping occasion. Letterman was discussing a recent encounter that Roberts had - she confronted paparazzi that were following her and taking pictures of her family at her kids’ school - Letterman asks for the fist bump, saying, “Nice going, way to go, give me one of those. Yeah, get in there on that.” Roberts locks it up, but then comments that it was her first time fist bumping, to which Letterman responds with another bump, since he doesn’t want to leave her hanging.

The rules of a man-to-woman or woman-to-man fist bump is vague. We’ll give them a pass here, as obviously Roberts was a fist bumping virgin, but they both knew well enough to not leave the other hanging (simple carry over from high-fives). If this was Leno on the other hand, I would have mercilessly mocked and chastised him for all of eternity (oh wait, I already do).

Here’s the video from the interview. The fist bump takes place at the 6:25 mark: