Chris Evans and Elizabeth Olsen visited Ellen to promote Captain America: Civil War, and Chris wasted no time hiding in Elizabeth's green room and jumping out at her—which was understandably terrifying. (Though to be honest, finding Chris Evans lurking in a corner sounds pretty non-terrible.)
Watch the prank go down in the video below, and please note that Elizabeth was lured into the bathroom with the promise of QVC products. Amazing.
By the way, Ellen also asked Chris and Elizabeth about their relationship, and while they made light of rumors that they're dating, Elizabeth did say, "Maybe we should."
We assume the internet will take that sentence and run with it. *Shrug*