I have to agree with Mary- I am sure the list would be shorter if we listed those who didn't.
I really truly did try not to. But in school, it was nearly impossible. I even saw my very good, no double-life leading friend once act as a double-life leader would. She and I went out to a club (GASP!), drank (although it was legal there) and dance with worldly boys- and later in the night- she made out with one of them!! She was probably the best witness I knew- so no one is impervious to it- even if just for one night.