Interesting to see I'm not the only person with an aversion to Nicholas Cage!
I have another contribution:
Worst film voluntarily watched at the cinema: Alex Rider: Stormbreaker
Oh. My. Sainted. Aunt.
This one does drop into the "so bad it's good" category, really, but I did actually pay money to see it at the cinema, so...
Where to start.
1) It stars Ewan McGregor. (spoiler: he dies before the opening credits in a scene that completely snapped my suspension of disbelief)
2) It also stars Damian Lewis (spoiler: he's playing a Russian, but you wouldn't know that by the accent that he can't actually keep up)
3) It also, ALSO stars Bill Nye (spoiler: what a waste of an actor!)
4) It also, ALSO, ***ALSO*** stars Mickey Rourke (spoiler: Mickey Rourke in eye shadow *shudders*)
5) The climax (set in centralish London) features a horse vs car chase (spoiler: I wish I was making this up)
6) The highlight of the whole performance was Robbie Coltrane, playing the Prime Minister, who was clearly doing his very best Tony Blair impersonation, even down to "Education, education and education"*. (The ten year old sitting beside me had no clue why I was giggling through that part.)
7) Then there was the bad guy's henchwoman who was played by Missy Pyle and who was some sort of pseudo-East-German dominatrix. (Or, if you're aware of 'Allo, 'Allo, think the character of Helga but essentially played straight rather than played for laughs.)
About the only upside to this movie experience (apart from the entirely unintended giggles) is that I watched in the cinema during one of the hottest/most humid weeks of Bristol's summer and so I got the benefit of the cinema's air-con for two hours!
*Not to get into politics, but that was a fairly famous soundbite from Tony Blair during a speech at the 1996 Labour Party Conference (yes, I did have to look up the date!)