The Understated Joke at the Last Second

The first time I watched Office Space I almost missed the funniest part of the movie. The main character comes home after everything falls apart on him- his plan isn't going to work, he's alienated Jennifer Aniston. He flops down onto his couch and knocks on the wall he shares with his gregarious, good natured neighbour to invite him over for a beer. The neighbour says, "No thanks," and mumbles something. When we were watching, I waited a few seconds and asked my brother, "What did he say?" and he replied, "I dunno, rewind it." The second time through we hear the lead say, "You awake? You want to come over?" and the neighbour says, "No thanks. I don't want you fucking up my life, too." We laughed harder at that than anything else in the movie.

I like those kinds of jokes, the ones that don't call attention to themselves and are slipped in at the last moment. Arrested Development and The Office both do this kind of humour well. This trailer for the movie The Ex has a perfect example:

On the whole, the movie doesn't look particularly enticing, but the final scene in the trailer is hilarious, and Jason Bateman's last line puts the situation over the edge.

These next two clips are funny all the way through, but both have that last bit that raises the funniness one level higher. The first is a trailer for a New Zealandian (Zealandish?) movie called Eagle vs. Shark, which though Napoleon Dynamite-esque looks pretty funny:

This clip is from Peyton Manning's appearance on Saturday Night Live. Again pay attention to that last line: