Paul Morigi/Getty; Steve Eichner/Getty

Theeyes of the worldwere uponWoody Harrelsonwhen he very nearly ruined aGrateful Deadconcert.

Harrelson, who is a longtime Dead Head, explained that he met the band through a mutual friend.

We chat for a minute and then theyre like, We gotta get out there.

Woody Harrelson attends HBO Special Screening of ‘White House Plumbers’ at U.S. Navy Memorial Theater on April 19, 2023 in Washington, DC; Phil Lesh, on bass guitar, Bob Weir, on electric guitar, Jerry Garcia (1942 - 1995), on electric guitar, and Vince Welnick (1951 - 2006), on keyboards as Grateful Dead perform onstage at Nassau Coliseum, Uniondale, New York, February 21, 1991

Woody Harrelson; the Grateful Dead.Credit:Paul Morigi/Getty; Steve Eichner/Getty

Im like, Ill sit on the back of my chair.

And then suddenly this wild, discordant cacophony of crazy notes just WHAM!

Well, I think to myself, Kinda genius!

hil Lesh, Bob Weir and Jerry Garcia of the “The Grateful Dead” performing at the Greek Theater in Berkeley, California on July 15, 1984

The Grateful Dead.Larry Hulst/Michael Ochs Archives/Getty

And in life, I was like Whoa!

The next thing Harrelson saw was a gaggle of roadies screaming expletives and running toward him.

Bruce goes, Woody, youre sitting on a live MIDI!

That was my first experience with them," he teased, “I jammed with the Dead.”

Weir, 77, later accepted the award on behalf of his bandmates.

Watch Harrelson discuss playing with the Grateful Dead in the clip above.