Sir Paul McCartney refuses to drink water while rocking out onstage - because he doesn't want to look unprofessional.
The 68 year old regularly performs three-hour concerts but insists on not guzzling water, admitting his preference harks back to his days in the Beatles.
He tells Britain's Daily Express, "I don't know, I just wouldn't want to drink water when I'm on. There is water (available) but I think it's the tradition that I'm from."
But the Brit admits he does take care of his vocal cords backstage before his gigs, adding: "I inhale Olbas Oil - put a few drops in hot water and inhale the steam or sometimes gargle salt water. I don't know if it does anything but the ritual does. It helps me mentally."