I really like bad movies. Nymphoid Barbarian in Dinosaur Hell for example. or how about Zombie A$$: Toilet of the Dead...classic.
But nothing really comes close to the abomination that is Marina Monster. Honestly it isn't fair to even call it a movie. It literally has in the beginning a 2.5 minute scene of sailboat footage. And not awesome sailboat footage, more like someone set the camera down and didn't know it was running. How that disaster came to exist is beyond me.