One bit of dialogue that made me laugh **SPOILERS**
Edward Lionheart (Vincent Price's character) "Officer, if I'm not mistaken, Mr. Psaltry is murdering his wife."
Policeman: "Oh, thank you sir."
I went to a screening of this movie at an all night horror film festival, and this played second. The audience roared with laughter after that line of dialogue.
BLACKOUT!