Two come to my mind right away.
Leprechaun: Back 2 da Hood
Seed of Chucky
Honorable mentions to Psycho 2, 3 and 4.
i'm expecting this thread to have a lot of sequels.
oh, i just saw one this weekend. dragonball evolutions with chow yun fat (why did he degrade himself by doing that movie?). it was funny to laugh at for the first 20 min but then just got really sad and lame.