When She Left Eliot for Ibiza
In Season 1, Eliot decided to stay behind on a trip. Margo wasn't willing to let him leave without some affectionate parting words.
Bringing a "Gun" to a Magic Fight
Here's the thing about fantasy series, if you apply the logic of having a gun, some things don't make sense. When the Brakebills students were going after The Beast in Season 1, Margo was very quick to point out that things would be much simpler if they could use a gun. In fact, she went beyond just a pitch she actually brought a gun on their trip.
When Her Uterus Saved the Day
In Season 4, a book called The Binder would only show its text if it had blood. Margo's solution was a bloody tampon. When Penny seemed rattled by the idea of menstrual blood, Margo came back with the perfect one-liner to shut him up.
Facing a God While Her Idenity Was Erased
Okay, another Janet moment. Let's be honest if Margo had been Margo and not Janet at this moment, she probably would have told Ember to go procreate with himself. Janet's reaction is almost sweet in comparison.
When She Tried to Get Quentin to Play It Cool
Alumni Week at Brakebills was serious business, and we got a glimpse of just how seriously Margo took things when she spotted a mentor. She was not willing to let anything stand in her way, even Quentin's concern about his father getting diagnosed with cancer.
Telling Eliot's Grandma to Piss Off
At the end of Season 4, after using the ice ax on Eliot she was determined not to lose him. So as Eliot lay there bleeding she told him off in true Margo fashion; even cursing out grandma in the process.