Bernadette: We were out one night, and things got a little spontaneous.
Amy: Oh, that sounds juicy.
Bernadette: Well, Sheldon was going on and on about time zones and railroad schedules, and I went out-
Penny: Wait, I remember that. Hang on. You did it at our place?
Bernadette: Kind of on Sheldon's bed.
Bernadette: I was headed to the bathroom, and I passed Howie on his way out. Usually he says, "Do not go in there," but this time he said, "Hey, let's go in here."