The sweeper was being used in a downtown parking garage early Saturday and the operator had left the machine temporarily. That's when police say Michael Moran, 26, hopped on and started it up.
Moran traveled several blocks before he was caught by people chasing him. Police have charged him with taking the sweeper without the owner's permission and drunken driving.
Police said Moran admitted to taking the street sweeper and said it was a stupid thing to do.