Nice work
You just need some voices (and please don't use a crappy microphone, that just takes all the humor away) and some scene change. It'd be good to know what Tom looks like, how he walks, etc. Right now you only have a couple of graphics and mouths disappearing. The mouth thing was the same thing that brought one of my animation's score down. This is a great storyline and you could go a far way with this.
More animation, less incessant noises in the background, and voices will make this a great work.
4/5, but for protection purposes, 5/5.