Image Newt singing and getting his creatures to help clean up the suitcase Enchanted/Giselle-style.
Percival's all "how are you real" and "this doesn't happen in real life why are you singing and dancing with your dangerous creature wth" like Robert (the divorce lawyer), but still reluctantly charmed by Newt.
Crack bonus: Grindelwald wants Newt on his side, because where else are you gonna find a wizard that can charm creatures to do their bidding with upbeat and positive songs/lyrics? So in attempt to get sway Newt to his side (and maybe some of his more dangerous creatures, Grindelwald will be happy with either), he, in front an audience of Newt/Goldstein sisters/Percival/aurors busts out into a song Prince Edward style.
Fantastic Beasts/Enchanted Mash Up
Percival's all "how are you real" and "this doesn't happen in real life why are you singing and dancing with your dangerous creature wth" like Robert (the divorce lawyer), but still reluctantly charmed by Newt.
Crack bonus: Grindelwald wants Newt on his side, because where else are you gonna find a wizard that can charm creatures to do their bidding with upbeat and positive songs/lyrics? So in attempt to get sway Newt to his side (and maybe some of his more dangerous creatures, Grindelwald will be happy with either), he, in front an audience of Newt/Goldstein sisters/Percival/aurors busts out into a song Prince Edward style.
Cue stunned reactions.