From today's SPD Blotter, written by the informative Jonah Spangenthal-Lee:

Officers Put an End to Man’s Early Morning Office Chair Ride

At around 2:30 this morning, Seattle police got a call about a man rolling down the western side of Capitol Hill in an office chair, and found the man near Lakeview Boulevard and E. Highland Drive.
When officers contacted the man—who was carrying a set of drum sticks, had a hubcap tied to his arm, and was wearing motorcycle goggles and several scarves and purses—he sat down in his chair and told police he was “late for a gig.”
The 29-year-old man initially gave police a fake name and then told officers to handcuff him.
After obliging the man’s request, officers sat the man back down in the chair and rolled him over to the curb. The man then rolled himself back into traffic and fell out of his chair (it happens to the best of us) but was caught by one of the officers.
As police helped the man over to the curb and sat him down again, he spat at an officer. The man missed the officer, but warned his salvo of spittle was simply a “warning” shot.
Officers then searched the man and found he was carrying a 12″ crowbar, and had stuffed a belt buckle and necklace into his gloves.
Officers took the man to Harborview for a mental health evaluation.