We once had a 3.X game in which the DM (hew to the gig) told us to make whatever we wanted, as long as it was legal. We had just picked up Bastards and Bloodlines (Awesome book) and I had the bright idea that we would all be half-brothers of a High Elf Bard father that was... not too picky. I played a Fey-ri, there was an Alicorn, and Aelar, etc... seven of us playing with a wide arrangements of alignments as well. SO much fun, and when he found out what we'd done, he nearly laughed himself to death. (He wasn't around during the actual creation process.)
Good Times