A Muni bus became stuck on the crest of a slope on Potrero Hill on Saturday morning for more than an hour, leaving passengers briefly without a ride.

The incident was captured in a photo posted to Reddit by Kimber Shaw, a San Francisco resident who was passing by on a Vespa when he came across the 10-Townsend bus crested on the hill of 20th and Wisconsin streets, unable to move.

Large vehicles residents skewer as humorously stuck on city hills have historically happened to out-of-towners — from commuter shuttles (like “Google Buses”), to shipping trucks. For a Muni bus, however, it’s apparently not so common.

“This is very rare,” said Paul Rose, a spokesperson for the San Francisco Municipal Transportation Agency, adding, “This re-route is commonly used without incident.”

A “neighborhood event” in the area prompted the SFMTA to reroute the 10-Townsend, Rose said, leading it up a 26-degree hill that required the use of the bus “overdrive” function, a gear appropriate for hills.

The operator will be re-trained, Rose said. The bus was stuck for an hour and 40 minutes.