I have gotten Yoplait (6 oz) through security in SEA, HNL, OGG, TPA, JFK, IAD in the last year.
I travel with my 2 young children (without my husband) so I don't know if security has pitty for me.

"Okay, that's fine. Confiscate it. But you guys have to explain to my kids why they can't have their Go-gurt."
That should settle any arguments!
Mike