"Bobby and I stashed ourselves in this john and were trying everything from the doctor's bag.
"Somewhere a fire started. There's bells ringing and people running down the corridor. As we left the bathroom, it burst into flames."
Meanwhile, Keith also revealed that one of his iconic guitars, a custom-painted Les Paul, was given a redesign when he took acid.
More from Spy:
• Breakfast stars reunite on radio
• DWTS star turned wedding singer?
He explained to Q magazine: "That picture was a hell of a trip. I started off with a pair of shoes and then went on to the guitar.
"I did it first to a pair of white boots I had. After I'd taken enough acid and finished them, 'OK, what's next?' The guitar. A hell of a trip."
- Bang! Showbiz