It's bad to not clean up after yourself.
Sal goes on a bender and has quite few bottles of beer watching football on tv.
Sal wants to get some rest.
Al tidies up the living room of his empties and heads to his bedroom to turn in for the night.
Sal falls asleep on the couch with beer bottles strewn all around on the floor.
Al wakes up the next morning with a bit of a hangover and gets ready for work.
Al groggily gets up in the middle of the night to use the bathroom and steps on a beer bottle, cutting his foot.