Gloria and Jay attend dinner with new friends on the episode "Our Children, Ourselves." The former looks horrified, doesn't she?
Is it really any shock that Phil loves 3D movies? That should really be expected from this character.
Cam and Mitchell are seen here on the episode "Our Children, Ourselves." It originally airs on 1/12/11.

Modern Family Season 2 Episode 12 Quotes

Cam: Tell me all about Mitchell in high school. Did he have a beard?
Tracy: You're looking at her.

It's an obsessive-compulsive thing. I have read like a hundred articles about it.