Photo: Instagram

A man was spotted grandstanding on top of a moving party bus in Richmond Tuesday evening.

Witness video posted to Instagram shows the man dancing on the roof and posing for selfies as the bus exited Steveston Highway onto Highway 99 just after 8 p.m.

The man, in a white dress shirt and black pants, is seen trying to keep his balance as the bus drove slowly along.

Thankfully, the driver pulled aside before heading onto the highway.

Neither the man nor the party bus company have been identified.