The shocking reveal! (not really spoilers, just trollin')
As per the synopsis: A couple expecting their first child discover an an unnerving difference between themselves and the couple living in the flat below them who are also having a baby.
It turns out that the couple in the lower floor are... MINORITIES!!!
Eric Cartman, "NOOOOOOOOOOOOOOOOOOOOOOOOOOOOO!!! Dudes, this was, like, the scariest movie I ever saw!"
;D