After taxiing for 8.5 hours, a United flight was canceled

An airline SNAFU caused a United flight to spend hours taxiing around the tarmac, boarding, deboarding, reboarding, and finally, after 8.5 hours of this, cancel. I hope they played the Benny Hill theme.

Aeroxplorer:

Ultimately, after 2.5 more hours of taxiing8.5 hours of taxiing in totalthe on-board crew clocked out and the flight returned to the gate to be anulled.