Countless. My Dad and I were obsessed with him 2004-2007 and it was so difficult to get a hold of his music even from online UK retailers so we had to order his CDs from a store in California and wait weeks for it to arrive.
I like the one that's a parody of Ridin' since it's the only one I know, but I don't really wanna say the name since I feel like it could offend someone, haha. It's the most memorable one of his songs to me because my cousins used to play it a lot when I was younger, so it kinda just stuck. I can never listen to that song now without thinking of the lyrics of the parody version in place of the original ones.
So many, I actually went to a concert of his and it was just as entertaining as watching his videos, for "You're Pitiful" he wore a million layers of clothes and slowly took them off and it was so amazing.