Melissa McCarthy finally met her musical idol, Billie Eilish [1] — although not quite in the way she'd likely dreamt. Just a few weeks after guest-hosting The Ellen DeGeneres Show [2] and debuting a hysterical spoofed "cameo" in one of Billie's music videos [3], Melissa stopped by the talkshow again on Thursday with her The Kitchen costars [4] Tiffany Haddish and Elisabeth Moss [5]. Just moments after Melissa revealed that Billie's mom was her improv teacher back in the day (what a small world!), the "Bad Guy" singer [6] popped out of a box to prank the actress — and holy smokes, she got her good. Watch the video above to see just how terrified yet ecstatic Melissa was to come face to face with Billie.