[flashback to Fall 2009:]
Ted: And so if you must bring food to this class, please bring enough for everyone. I don't wanna see someone eating, say, lobster in the front row without sharing with the rest of us, because that would be "shellfish."
The Mother: [laughs] Come on, that was funny.
Ted: Anyway, this is Architecture 101.
The Mother: Architecture 101? I'm in the wrong class. I have to go.
[She runs across campus before checking her paper map:]
The Mother: Oh. Wait, I was in the right class.
Ted: First day as a professor, wrong classroom. Coming through.