Want to reproduce choppiness in actors movements through editing/plugin ?

Question

I recently watched a video that the actor's movements were intentional somewhat jerky/choppy through some editing and I would like to reproduce the choppiness. It seems to add a nice comedic effect to the video. How do you think this was done?
Here's the link:http://www.youtube.com/watch?feature=player_embedded&v=EuWT4WBd1eM  
Thanks for any input.
Damon

Answer 1

I only suggested Strobe for working on something that's already "in the can". But...
I had to watch the video again -- last night I was completely distracted answering some questions while in the middle of putting together a 16 Point mask in Motion (which **should be** a trivial task, but it's not...:/ -- by the end, a single action would take about 10 minutes... [but patience paid off!]) and I agree with you that the video was shot at a "slower tempo" (but not necessarily "slower") and then sped up in post.  One of the nice things about FCPX is that you can change the speed of the video without sacrificing the pitch of the audio (i.e., you won't turn everyone into Mickey Mouse if you speed it up.) Preserve Pitch is on by default, isn't it?
Anyway, here's a speed change/pitch unchanged demo (my "take" on Here Comes the Sun)-- the intro is normal speed, the rest is 133% (no "retuning" necessary).
http://www.youtube.com/watch?v=rm8OPDsx5PQ
Putting this together led me to another consideration: @ the 39 second mark, there was a pause in my playing that I edited out leading to the "jump" in the action (it's still a terrible cut, but I was in a hurry). I figure a good way to enhance the effect is to "choreagraph" pauses into the filming and edit them out in post in order to maintain a specific tempo. And, some pretty weird stuff can be done changing speeds all over the place (within limits, of course.)
[PS - the video quality is atrocious... but I finally found something to use it for! I was sitting in semi-shade - one camera pointed at the tail [almost completely "blown out" by sunlight -- no amount of "color correctlion" will save it] and the other pointed at the fingerboard. I can't even use it for an instructional video... oh well. BTW - that poor old beaten up Takamine is 50 this month!]