Ariana Grande was full of surprises on Thursday night's Tonight Show.
She joined Jimmy Fallon for the "Best Friends Challenge" -- a game where players try to guess fun facts about each other -- and we can pretty much confirm that Fallon and Grande are not best friends. We can confirm that Fallon hates mayonnaise and that if Grande could be any animal, she'd be a seahorse (aw).
We also learned that Grande's first celebrity crush was a (probably) Grinch-era Jim Carrey -- who, contrary to Fallon's guess, is not Jimmy Fallon.
Can't win 'em all, Jimmy.
