An obvious first choice, The Rocky Horror Picture Show
A personal favorite of mine is Deathrace 2000
Any list like this would be incomplete without Monty Python and the Holy Grail
A rarely seen animated classic is Wizards
Spiderman? Batman? Superman? Who is the greatest superhero of them all?? A no brainer. Buckaroo Banzai is a combination rock star/stuntman/brain surgeon/research scientist.
Quite possibly the most recent addition to this list would be "The Eye of the Beholder." This movie ranks,...well it is just rank. A complete waste of two hours of your life. Not only bad, but absolutely nothing bad enough to laugh at.
Of course, this list is far from complete. I am always looking for more bad movies to watch and perhaps add to this list. If you have any suggestions, please send them to me!!