As far as Halloween raps go, it doesn't get much better than My Mind is Playin' Tricks on Me. The song uses one of my favorite samples, Isaac Hayes' Hung Up On My Baby. Some more hip hop with a Halloween theme:
We Mix On Your Grave, an hour long dj mix featuring hip hop, grime rap and a little bit of hipster music.
One more Halloween video, the classic "Never Scare a Black Man." Possibly the only funny clip to ever come out of America's Funniest Home Videos.
And because I don't feel like putting up a separate post for it: Jay-Z responds to Jim Jones on Flex's Hot 97 show. During the 20 minute interview, Jay also talks about Superhead's book and the release date of Nas' album (not coming until after Jeezy and Ghostface release their albums). Link taken from RapMullet.
Finally, if any of you are looking for a scary movie to watch tonight, I recommend The Audition.