The first happened during morning drive time Monday or Tuesday. One of the Sports Junkies gave away the ending of the Scorsese movie 'The Departed' (specifically, who dies at the end).
I know the movie came out six weeks ago, and that it was a remake of 'Infernal Affairs' from 2002, but you're still a dickhead.
The second one was more my own fault -- I was reading a Fark thread about some lame The Top 10 Movie Spaceships article.
As usually happens in sci-fi threads, various other shows came up and were discussed, and I stumbled upon a fairly significant plot point from season 3 of Battlestar Galactica.
I still haven't seen any episodes -- they're piling up on VHS. In theory. At this point, I'm not sure which tapes have which episodes, and I may just need to wait until they start over in repeats.