Vernon Kay's TV career was almost over in a flash when Chris Evans tried to sabotage his big break by stripping off behind the camera.
The host of hit shows including All Star Family Fortunes and Splash! was in a rehearsal for Evans's Channel 4 Saturday night show Boys And Girls when the DJ revealed all.
Kay told a Royal Television Society (RTS) event that working with Evans on the primetime show was a "big learning curve" and he was given only a few hours to learn his script.
He said: " It's the most nerve-wracking thing to be on live telly... I hit my mark and nothing came out. I stood there thinking I know it begins 'Hello and welcome to Boys And Girls'. So I said that and literally this whole script vommed from my mouth and I couldn't stop talking.
"And then this ginger penis bobbled underneath the camera. It was Evans, he'd taken all his clothes off.
"He said 'You didn't bat an eyelid when I jumped across naked - that proves you know the show'.
"And I'm thinking I just didn't want to look at your knob."