10 Actors Who Didn't Know They Were Being Filmed For Movies
2. Robert Pattinson - Twilight
Even while doing the press rounds for the Twilight movies, Robert Pattinson could scarcely conceal his disinterest in the franchise, and on the DVD commentary for the original film even admitted that he didn't realise the cameras were rolling during a particularly snoozy take.
At roughly the 11-minute mark of the film, Bella (Kristen Stewart) enters the biology class and is seated next to vampire Edward (Pattinson), who's looking more than a little sleepy. Pattinson said of the scene:
"I didn't actually know they were rolling when we were doing this scene... I was just kinda cold."
If the intent was to capture Pattinson unawares and milk the awkwardness of his and Bella's first meeting for every drop, then it certainly worked.