Two words: Jump cut
In film, the jump cut, or abrupt transition from one frame to the next, functions like a quick, confusing, and incongruous utterance. The viewer is required to fill in the missing rationale or logic, although she doesn't realize it. In humor theory, incongruity theory describes "laughter in response to a perception of incongruity." The jump cut evokes humor, as seen on Vine, the popular short video mobile app with a growing number of aspiring and established comedians.
Because Vine is a short 6-second video platform that allows the user to manipulate time and space by pausing and dragging a scroll bar on a mobile screen, it's the perfect medium to evoke humor through incongruous--or (also conceptualized as) bizarre, queer, inappropriate, odd, discordant, contrasting, "ridiculous" imagery.
The jump cut transition, along with the cutaway is oftentimes a meta comedic device also found in the popular animated sitcom Family Guy.
So there you have it: The medium, in this case, Vine, is the message, humor.