Monica caters her mother’s party and loses a fake nail in one of the quiches.

Monica – You bet that I’d screw up? All that stuff about hiring me because I was good was…
Mrs. Geller – No no no, that was all true. This was just in case you pulled a Monica.
Monica – You promised Dr. Weinberg you’d never use that phrase.

What does 'gay' mean?

Lesbian, gay, bisexual and transgender (LGBT) teens experience homophobic remarks and harassment throughout the school day, creating an atmosphere where they feel disrespected, unwanted and unsafe. Homophobic remarks such as “that’s so gay” are the most commonly heard; these slurs are often unintentional and a common part of teens’ vernacular. Most do not recognize the consequences, but the casual use of this language often carries over into more overt harassment. [from]

Phoebe – Just change what it means, you know. Go down there and prove you mother wrong. You finish the job you were hired to do, and we’ll call that, “pulling a Monica.”
Monica – What?
Phoebe – Okay, um, if a kid gets straight A’s, his parents would say, “Yeah, he pulled a Monica!” Or a fireman saves a baby, and they go, “Yeah I know, he pulled a Monica. Whew.” Or someone hits a homerun, the announcer says “Yeah, that one’s outta here.” ‘Cause somethings don’t change.