Fax

To have and share with an audience a random and irrelevant to the situation thought.

Doing maths homework with a colleague at university and discussing complex algebra. He turns around and says:
- Mate, I just remembered - my dad has never actually wiped my ass as a baby, it was always my mum who did it.

- Seems like you've received a fax, mate, haha!

*Awkward silence follows*