re: Have you or anyone you have ever known switched teams?

No, pretty much everyone I know who is gay was always on the other team (whether they acknowledged or not).

One guy I know from college I did not expect, but he was so high all the time the normal signs were probably skewed a little.

My GF has a couple friends from grad school who went through huge overhauls all the sudden, divorcing husbands and getting in relationships with girls within months. They're all nuts though, so I don't know if it is really a preference or just Lohan-like attention seeking.