The movie in question is 'Witching and Bitching' (original title: Las Brujas de Zugarramurdi)
The viral video being parodied here for those of you who would have missed it
For more funny Key and Peele sketches, search for 'Key & Peele' on Izismile or go on Comedy Central's Youtube channel.
Some funny reactions in this prank plus one kind of scary...
This is 'Between Two Ferns' with Zach Galifianakis and Justin Bieber