To find the truly worst films you have to look back a wee way, Without doubt the worst film I ever saw was called night screams. Its a bit like scream but worse, I think they had like a 30p budget or something and they spent most of that on curly wurlies. The box had some guy covered in green goo, that was eating his skin away, at no point in the film, is there any green goo or skin eating let alone the combination of both.
While on film tak i just got the usual suspects, heat and casino all on vhs off ebay for a grand total of 2.50 rock on.