I've got a neat human skull with a calvarian cut that my dad gave to me on the day I graduated from University. He obtained it about 40 years ago when he went through medical school, and now passed it on to me. I can foresee this becoming some strange family heirloom Other than my huge alligator skull that was an anniversary present from my boyfriend, my favorite has to be my collection of La Brea bones. None of these are skulls, but it's a really neat assortment of random bones and teeth, with quite a few vertebrae, that were dug out of the La Brea tar pits in 1903. There's some coyote, horse, dire wolf, smilodon, and giant sloth bones. I was lucky enough to just be browsing through some random antique mall when I noticed this vendor had this giant collection of bones with original collection tags from the 1900's. Turns out the guy whose collection this was, was the man who dug then out of the tar pits. He had died a few years ago and his wife wanted to just get rid of them, so she gave them to this dealer to sell. I got my whole collection for about $120, and there are a lot of bones!