Officials say the white-tailed deer crashed through the windshield of a public bus being driven Tuesday evening in Johnstown, about 65 miles east of Pittsburgh.
The deer hopped around frantically near the driver before jumping on empty seats and running in circles in the aisle.
Authorities say the driver stopped the bus and opened the door and the deer got off. Cambria County transportation spokesman Josh Yoder says it "just walked off the bus."
The bus was carrying one passenger, who was seated in the back far from the deer. No injuries have been reported.
The bus has been taken to a maintenance facility for repairs.
There is no word on what happened to the deer.