"My Fake Baby" is a Channel 4 documentary exploring "the lives of women who spend hundreds of pounds on life-like baby dolls. Loved like real babies, they're taken for walks, cuddled and even have their nappies changed." Parts 2, 3, 4, 5.
You can teach your mini-me all kinds of wonderful things. Among them to settle themselves to sleep, to use american sign language or be physically superb. Now, you can teach them to save themselves from accidentaly drowning in the pool (flash vid).
If you ever feel like you just aren't particularly amusing, what you need to do is find a pack of 1 year old quadruplets. Those kids will laugh at anything.