3. Alan Garner (The Hangover)
"You are literally too stupid to insult." Stu Price (Ed Helms) pretty much summed that up beautifully when referring to Alan Garner (Zach Galifianakis). He is immature, dimwitted, hapless and somewhat psychotic. Alan was responsible for drugging The Hangover group in the original movie, which resulted in them doing all kinds of crazy things and completely forgetting about it all the next day. His other stupid moments include volunteering to be tasered, thinking that rings were given out at the holocaust, accidentally drugging the group for a second time in the sequel and driving along a highway with a giraffe in his car in the third movie.