Apparently, that is from Woody Allen's film
Manhatten Murder Mystery
Quote is here:
Larry: "I decided I'd cook dinner tonight. My one dish: tuna casserole. Tell me if I put in too much hot fudge."
Larry: "The dead woman passed you on a bus? Which bus was this, the bus to heaven?"
Larry: "I think it's a pretty fair assumption if somebody is dead, they don't suddenly turn up in the New York City transit system."
Carol: "I don't know what's going on."
Larry: "Let me put it this way: total psychotic breakdown."
Carol: "I'm telling you, I saw Mrs. House."
Larry: "Yes, I know, on the dead persons' bus. No car fare."