We had a creepy dude at my workplace today.
Buzz cut British dude, completely unaccessible. Crazed expression. Was flippin a coin (a penny) in one hand really slowly, over and over again, while very slowly moving the other side of his body with his other hand towards his bag on the floor.
No response when spoken to. We kept our cool and spoke to him gently, and told him that he would need to buy a ticket to enter the museum. No response. Again. No response. Again. "Yeah no I am just wat bi hal fu kna bubbel. Hu!'.
Started moving around the museum in slow motion. We tailed him. Eventually made his way to the exit. Shouted 'Sieg Heil' when going through the exit. Walked around the perimeter of our building two more times, staring inside. Finally crossed the road away from us neglecting high speed traffic.
Really, all three of us thought he was going to grab a gun from his bag and start shooting.
Another colleague told us that the same guy jumped onto the stage of our city theater the previous day, flipping out and becoming violent.
Luckily, he didn't turn violent at our place except for the 'Sieg Heil'.
Half-educated guess from 20 year pub working experience: Angel Dust (PCP / phencyclidine). Or just plain psychosis. Or perhaps just a 'normal person' who thought he had found the headquarters of the pedophile baby-eating reptialians from Alpha Centauri that are controlling our governments. Because our museum looks like a UFO.