"Baby", "Babies" or any thread where the title suggests there's going to be a picture of a baby there. I know they're their mothers pride and joy, but they all look the same to me.
Dog, Cat, Hamster, Guinea Pig etc will probably also ensure the thread remains unclicked.
On the other hand, if it was a thread by Chiller, I don't think I'd be able to resist my morbid curiosity.