I do this on a larger scale professionally, along with other cool visual tricks with projectors (like projecting onto water droplets). Thanks to VEGAS' Mesh Warp effect, and its integration with VEGAS Post, it can be used as a video projection mapping content creation tool. Here's how to do it... and also a visual representation of exactly what video mapping is, for those of you who don't know.
This is a very simplified form of it, the more advanced projects have us making 3D scans of entire buildings, telling CG animation software specifically where each of the projectors are (as many as dozens of them all shining a part of one big image) in the to-scale virtual set that aligns with where it is in the real world (down to the height it is from the ground and the angle it's pointing at), and months of animating. However, you can do basic mapping in a matter of minutes, and the results are really cool if done right. If you have a projector laying around, try this out... you can map your dresser, closet door, walls and ceiling, any object you can fit into the beam.
It makes for a really cool tool for making unique Halloween or Christmas decorations as well.