Sales rep Stuart McMahon, who was eating supper with his girlfriend, said: “This guy came running in then charged into the kitchen, got a massive knife and started waving it about.

“Everyone was screaming and running out as he jumped on a table, dropped his trousers and popped his penis out. Then he cut it off. I couldn’t believe it.

“The staff were really upset and there was blood everywhere.”

Was he making a statement about guns?