Ted: The most important facial expression of all.
Barney: Whoa.
Ted: Flared nostril ridges, wide unblinking eyes. If you ever, ever, see this face Barney: run. And don’t take a picture of it, she will punch you, and you will cry, for the third time, that night.
Ted & Barney: *shudders*
How I Met Your Mother 5.03 - “Robin 101”