Still needs a lot of work I think
As for the stickman vs. silhouette... I say silhouette instead of stickman because stickmen don't have things like feet and hands, and they are possible devices for showing character in an animation and should not be ignored... that being said, stickmen do provide the most important parts of motion for an animation such as this, so they are pretty ideal for this. I would rather see stickmen than silhouettes where the artist looks at the animation, says "hmm, needs to be sneakier" and gives the guy a long pointy nose and a wiry beard, because that defeats the purpose of what I intended to do with this challenge, which was concentrate attention on the animation rather than character. So when I said sihoulette, I meant a generic silhouette, as if you needed a sort of template for any sneaky characters (don't let that stop you from taking that "template" and showing us a fully rendered character you made with it, though!) Sorry if I was unclear.
Great entries everyone. I'm really glad people to see people so many people trying it, especially those new to animating. I'd give critique but I can't really say anything better than what Adam did, and I'm not that great myself. Maybe I'll through everyones later, though...