The best I've seen so far is a Mummy and a Simbot standing in front of each other doing the "Oh I've seen a Mummy" and "Oh I've seen a Simbot". They'll do that for ages, i've had to intervene everytime. It got so irritating that I had to kick the mummy out. Kept the simbot as the mummy was too slow for me. Also all it ever wanted to do was dance.