I know I am being nosy but I need to know?

because my neighbors wake me up...everyday like clockwork they are in their bathroom for hours at a time slamming and banging so loud I am about to call the cops. It sounds like a metal cupboard or something....it will slam every five minutes for like an hour. It has to be that they are growing pot. they must have some type of cupboard in their bathroom to keep it in....what else could the slamming be?