What time is it

Two buddies are up late smoking a beer.

The first guy says “what time is it” to which the second guy says “I’m not sure, here give me that trombone”

The first guy asks “how the hell can you tell the time with a trombone?!”

“It’s magic” replies his friend and as he says that he lets out a long, low belt on the trombone. He stops and waits, seemingly expecting something

Suddenly a loud voice calls out from the room above

“Who the fuck is playing the trombone at 3 am!?”