The nine men bumped into Hawking and his son getting out of a car in the scientist’s hometown of Cambridge.
The group has gotten lost and were searching for a pub when they came across the cosmologist, who agreed to pose for a photo.
According to the stag, Chris Hallam, the 71-year-old’s son was asking if the two could “ditch the meal” and “go out with these boys” instead.
“They could have just told us to carry on but they were brilliant. It’s been mad.”