[Sheldon is discussing Leonard's failed relationships with Penny]
Sheldon: So what is the "down" and the "low", and don't worry, this is all entirely confidential, so you feel free to include any and all shortcomings in the bedroom.
Penny: We never got to the bedroom.
Sheldon: Because...?
Penny: OK, all right, you know what? I'll tell you what happened. We were young, we were very much in love, but we could only communicate through a time-traveling mailbox at my lake house.
Sheldon: It's not enough that you made me watch that movie, but now you mock me with it?!

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