noises from below

last night, at approximately 6:00 a.m, an unusual amount of yelling was heard from the street (or maybe, even... another apartment). I also swear that I heard a BANG! amidst the yelling. 

I asked Amy about this when we woke up this morning, and she admitted that she, also, heard the yelling. 

my theory: the (bang!) was a gun. someone was shot. hence the yelling.

amy's theory: "it sounded like they were playing a board game or something!" 

thoughts? other theories?