Y'know, I'm wondering... it could just be that I'm currently having extreme delusions of the power of the internet... but as there have been so many "PATTI STOPPED THE SHOW!" stories going around, and as it was the last week of
Gypsy, maybe Patti did it on purpose to give the unicorn hunters a bit of a thrill. Who knows? In some parallel dimension where there is no internet, or where the people on the internet *uniformly* said "that's terrible!" instead of throwing out a ton of "OMGILOVEHER", perhaps in these parallel dimensions, Patti just kept singing and the show wasn't interrupted at all. But in this dimension, there was just enough "THAT'S FIERCE SHE'S AWESOME" flying around to make her think "aw heck, what've I got to lose? There's loads of people out there who'll think it's awesome, so let's do it!".
Yeah, stupid theory, but still. XD