I've seen many movies over the course of my life, some good and some bad, but I can think of 3 movies I saw that were the absolute worst. Those ones being Zoom, the live-action Cat in the Hat movie with Mike Meyers (I personally call it The Crap in the Hat), and The Legend of the Titanic. While I don't remember much about Zoom (in fact it was something that just popped into my head as I was typing this post up), the other 2 left scars.
The Crap in the Hat I purposefully avoided when it came out, but then came across it when I was sitting in the waiting room of a kid's dentist office and watched it as I had nothing better to do. The only part that I remembered laughing at was when the cat let out that extremely long and loud belch, but even then Will Ferrell did the exact same thing in Elf so it doesn't even have that going for it. Everything else was just total garbage from the freaky designs of the cat and the Things to the adult jokes that came off as juvenile and unnecessary. I know for certainty that Dr. Seuss himself was rolling in his grave several dozen times at this abominable cancer of cinema.
While that movie I had tried to avoid at every opportunity, Legend of the Titanic I had watched willingly (and regretted to this day). The biggest reason for that was to see how bad it was. I'd heard others say that the movie was even worse than Titanic: The Legend Goes On, but I didn't believe it was possible at the time. I mean, how could anything possibly be worse than the infamous rapping dog? Oh it found a way alright. While the animation was definitely better, this movie was insulting to a level that I felt unclean watching it. The way that it passed off one of the worst tragedies in history as a platform for a "Save the Whales" initiative and showed no respect for those who died by saying that those deaths never happened and that everyone survived is repulsive to say the least. But even taking that out of the equation, the movie has the consistency and logic of a Uwe Boll production. While I'm sure that there are even worse movies out there, this one is just the worst one I've ever had to witness.