There was that scene in Mel Gibson’s *Hamlet *where he says “Oh, what an ass am I.”
I’ve always wondered if the butt shot in that scene was intentional.
Then I saw it again after his antisemitic rant and thought that, yeah, he was still an ass.
I watched parts of Die Hard 3 last night. The one where Hans Gruber’s brother is sending Bruce Willis all over Manhattan for various nefarious purposes. At one point, Bruce commandeers a fancy car and calls his precinct captain on the fancy in-car cell phone. Which fails at a critical juncture and Bruce hangs up, saying “Crappy cellular phones.”
Meanwhile, I’m looking at the movie and its reliance on pay phones and police radios and thinking “Where are all the cell phones?” I didn’t think the movie was that old, but in the time since it appeared, we’ve gone from cell phones == luxury item to cell phone == inseperable companion.
One line in that movie that cracks me up every time I see it is where he’s trying to fire the pistol on the boat and it’s not working, the bad guy takes it from him, flicks the safety off and proceeds to shoot him in the leg. He then comments, “See, now THAT works!”
Comedy gold, unintentional or otherwise. 
You mean the Ark of the Covenant? The Holy Grail is a cup.
Indy picks a simple wooden cup from the midst of several ornate goblets because it looks like “the cup of a carpenter.”
No.
No, you aren’t.
I’m watching Cast Away, released 5 years later (2000) and Tom Hanks gives his wife a pager for Christmas. Talk about buying right on the cutting edge of obsolescence.
I thought that’s what we were supposed to do.
Spock’s funeral in The Wrath Of Khan. I remember how the entire audience burst out laughing when Scotty played the bagpipes.
Diary of the Dead. The entire movie. I’m not sure if it was intended or not, but if it wasn’t…the whole movie is my submission.
'nuff said. 
mine would also be an entire movie, in its entirety (wtf is that a word?) Reefer Maddness
its possibly the greatest unintentional satire ever