Hollow man wasn't so much bad, as it was offensive. The rape scene was so bad, i actually thought about writing a letter in complaint.
My call for worst movie (and in my opinion you guys aren't trying very hard) is
Hardware.
I saw this movie in highschool. Me and my friends hated it so much, we stood outside the theater afterwards for twenty minutes telling people purchasing tickets not to see the movie. We did this until the theater manager gave us our money back. It was bad, really bad, but not in a laughably bad sense, it was just awful.
Another one is
Guilty As Sin with Rebecca De Mornay and Don Johnson. This movie bit as well. But it was laughably bad.