A lot of films I just HAVE to look for this.
In How to Eat Fried Worms they state that “No Worms Were Harmed in the Making of this Film. Including This One” (Over a shot of a worm – evidently a construction – being zapped)
I saw some movie with a title like “Cheerleader Massacre” (not the exact title) that stated “No Cheerleaders were harmned in the making of this film”
Yes, always. (Unless the movie sucked incredibly bad.) I did this before I was married and luckily my wife decided she likes it as well. Usually we are the only people who do stay.
For any potential Easter Eggs and also to see details of where the movie was filmed, who is thanked, funny job titles, etc.
I stay through the credits for many of the reasons above. There’s also enlightened self-interest. Two of the things I’m interested in are where the movie was filmed, and who performs on the soundtrack. Those two little bits of info are usually at the very end of the credits.
In the past yes. Now no.
Looking for extras and to see the actors and maybe the songs. Now I don’t because the wife doesn’t like it and IMDB works real well. Always happy to hear when there is an extra bit so I can stay. Thanks for the tip on Cloverfield.
I’ll usually stay
to listen to the music, especially if its an original score by John Williams, or someone. Pop music, not so much.
to see any little jokes at the end.
For reasons I no longer remember, I stay at least long enough to read the name of the key grip.
I used to stay, but the credits are just so freaking long these days, especially on big-budget movies. With IMDB I can usually find out anything I was curious about.
Sometimes I watch them, sometimes I don’t. It depends if I want to see the name of the babe who played the “Third waitress from the right” or something like that. The exception being a Zucker Airplane!/Naked Gun style movie where I know they’ll be some good jokes in the credits.
Usually no - unless I know that there will be something extra in the credits.
I don’t find them entertaining - unless there’s something extra.
I usually do. The Boy works in the CG industry, so we usually sit through the credits to find out who was responsible for the effects, especially if it was a company he’s familiar with. Given that they’re non-union, the animators always end up right at the very end of the credits, after caterers and accountants and dog-walkers.
It’s nice that some filmmakers have started to throw in a couple of goodies to reward those of us who stay all the way to the end. It makes me feel appreciated. 
Sometimes.
I stay if I was impressed by the performance of an actor I didn’t recognize, or if I was impressed by the music, and want to see the song credits. While I could use IMDB for the former, I’m not all that likely to remain interested long enough to do so.
Yes, if I liked the movie.
Because I like to see who worked on it, locations, etc.
Yes, always, unless I’m bursting at the seams, but that’s rarely a problem, or we have to scramble to get to another movie before it starts, which happens sometimes. I’d rather miss the credits of one movie than miss the beginning of another.
All the same reasons mentioned above (except for the key grip thing) but most especially ArchiveGuy’s reason, because a movie is not over until it’s over, and the credits are part of the movie and therefore, to us, the movie is not over until the credits are over. Thank goodness my husband feels the same way.
I love directors who put interesting things into or after their credits.
Always. The wife was kind of weird with it when we first started dating, but she’s gotten used to it.
All the reasons above. I like to see if I know anybody listed as one of “the little people.” Besides, if you walked out before the credits were over when you watched Wild Things, you saw a completely different movie than those of us who stayed. Completely different.
If there’s an easter egg, I’ll stay. If there’s a large crowd, I’ll also stay: why hurry and be stuck in the throng?
And sometimes I need to come down emotionally from the film.
I usually sit through the credits, partly to squeeze the last bit of potential entertainment from my amusement purchase.
Key Threadmover: Czarcasm Moderator
To me, a big tip-off is whether or not the house lights come up. If they stay out, I stick around.
If the movie is crowded, I wait until it has cleared. Mostly because I hate crowds. If I have to pee real badly, I jump up and run for the door. Sometimes I wait to see if there are any neat scenes. So it all just depends.
Sometimes I stay. Depends on who I’m with and if there’s something I want to see.
Almost always -
2) I hate fighting crowds, it is preferable for me to sit and relax until the lines fade out so I can walk out in peace.