I'm with Watchman. If you really want to expand your Horizons on how awful a movie can be, here are a few of my personal recommodations :
3.SCHOOL'S OUT ( damm, that movie should blow Scream 2,3 from your worst list )
6.LEPRECHAUN 4 - IN SPACE
7.TEXAS CHAINSAW MASSACRE 4
8.MANOS - THE HANDS OF FATE ( it's even considered one of the worst movies ever on imdb )
If you watch these movies, I gurantee that you are praying for the Blair Witch to come along!