I'm sure there are more I'm forgetting, but here's what comes to mind:
Birdemic
Samurai Cop
Sharkboy and Lavagirl
Special emphasis on Sharkboy and Lavagirl. I don't see enough people talking about this one. It really sucks you in, and it feels impossible to stop watching.
What are your top 5 favorite BAD movies of all time?
Not your best, but your worst! B-Movies abound!...