Badly done/obvious exposition.

[Evol]

Like, where it's totally obvious, that the explanation is entirely for the benefit of the audience, because the character receiving it would already know.

The worst one I can think of is in Apollo 13, where a Flight Controller is explaining, to Gene Krantz, that they need a burn, because "at this rate, they'll nick the Earth's atmosphere and bounce off into space, and we'll never get them back".

I mean, why would Gene Kranz, the most experienced Flight Director in NASA, need something so obvious, explained to him

 

[jayberwanger5150]

The Abyss, when the Navy Seal does that ridiculous explanation of pressure psychosis. Gawd that scene really grates on me

 

[Stranger In Florida™]

A lot of Prince of Persia. We see him doing the time thing twice, then he asks about it (while answering his own question), and the princess replies and explains further.

GODAWFUL movie.

 

[Who wants to know?]

http://mysterymanonfilm.blogspot.com/2007/07/mms-exposition-example.html

Great example here, comparing two versions of the same film - one with very clunky exposition, the other done much more naturally.

 

[Tricia]

'The Core' a shockingly bad movie, has some really terrible exposition.

When Stanley Tucci's character is explaining how the Earth will be burned to a crisp, the assembled Generals and leaders only seem to understand when he uses an aerosol to set fire to a peice of fruit.

 

[Kennith C]

Just about the whole of Avatar.

"This here is Unobtanium, we are having a very difficult time getting hold of it....."

 

[| thE-paK araB roCker|]

Day After Tomorrow when Jack explains climate changes to a room filled with climatologists and they all seem very surprised.
Of course the science of the movie is awful anyway, but still..