I share a couple of those which already have been mentioned:
Avatar - One of the most painful experiences i ever had to endure.
Funny People - Me and my friend were just looking at each other at certain points in the movie, smiling, and wondering what are we doing here. We were genuinely amazed that something can be that bad.
One that hasn't been mentioned but is probably the absolute worse i can think of:
Knocked Up - This is probably the biggest mistake in my life in general. I knew upfront i was getting myself into something bad, but i was up for being a little provoked. I just didn't expect this much.
Avatar - One of the most painful experiences i ever had to endure.
Funny People - Me and my friend were just looking at each other at certain points in the movie, smiling, and wondering what are we doing here. We were genuinely amazed that something can be that bad.
One that hasn't been mentioned but is probably the absolute worse i can think of:
Knocked Up - This is probably the biggest mistake in my life in general. I knew upfront i was getting myself into something bad, but i was up for being a little provoked. I just didn't expect this much.