I was Velma at GalaxyCon, and so many amazing people played along as I "unmasked" their

I was Velma at GalaxyCon, and so many amazing people played along as I "unmasked" their characters. "And I would've gotten away with it, too, if it weren't for those meddling kids!!"
.
(TITLE FROM REDDIT r/pics)

All fun and games until she discovers that Predator mask isn't a mask at all.