It happens to the best of em!

In a rare screw-up, Billy Joel forgot the lyrics to his hit 1989 song "We Didn't Start the Fire" during a concert at Toronto's Air Canada Centre.

When the musician lost his place, he quickly stopped the band. "Wait a minute. That ain't right. All you gotta do is f**k up one word in that song and it's a train wreck," he said.

The 64-year-old has always hated his chart-topping single, but when he tried to move on to Uptown Girl after the mistake, the audience wasn't having it!

"It's the same thing verse after verse," the songwriter complained. "Just the words change. It's one of the worst melodies I ever wrote."

But luckily for fans, Joel dutifully finished the song and it went off without a hitch!

"That'll be all over YouTube tomorrow," he mused. "It's okay. It was an authentic rock and roll f**k up. We're not on tape. You don't see much of that anymore. Ok, let's hope we get through this one."

Watch Joel's mistake below: