I think I would believe:

1 (Mind Control Lasers). For some reason that doesn't seem that interesting. Perhaps because it involves powerful conspiracies. It would be saying that the MIB etc do play with out minds, but they don't have to be very dilligent because we do a lot of the work ourselves.

3 (In the Stupid Third). This one is strangely resonant. Why doesn't some one take pity and give me a hand ? I know how much dismay it causes me when faced with the prospect of explaining something complex to someone else ...

6) (The Third Sex) Read the story "The Belonging Kind" by William Gibson and Bruce Stirling for inspiration.