When I was an engineer at a building in downtown Seattle, we had a bank right on the corner of my building.
One day a bum wandered in, took all the deposit slips walked outside, threw them in the air shouting "I'm rich! I'm rich! Hahaha!"
Of course I had to ask him to not enter the building again, blah blah.
He told me he'd be back in one hour to kill everyone in the bank and me, then flashed a shiv at me.
I called the cops but they shrugged it off and said he'd be gone before they get there. (Seattle police ignoring death threats; great job guys).
He did leave finally and never came back, thankfully.