The actors hit the red carpet in Hollywood decked out in the costumes from their viral 'SNL' sketch.
When Ryan Gosling and Mikey Day played two guys who looked remarkably similar to Beavis and Butt-Head in a Saturday Night Live sketch earlier this month, they had no idea what a viral sensation it would become.
Doubling down on the hilarity of the sketch, Day made a surprise appearance -- while Gosling worked some quick-change magic -- at the red carpet premiere of The Fall Guy on Tuesday in Hollywood. The pair surprised those in attendance by rocking their Beavis and Butt-Head costumes at the star-studded event.
After Gosling walked the carpet in a stunning mint green suit -- looking as stylish and handsome as ever -- he doubled back and walked the carpet again, this time side-by-side with Day, in full costume and makeup.
Gosling rocked a powder blue shirt with the words "Death Rocks," alongside black cargo shorts -- perfectly matching Beavis' ensemble from the iconic '90s MTV cartoon.
Meanwhile, Day mirrored Butt-Head with a dark gray T-shirt reading "Skull" that he paired with red shorts, high-rise socks and black sneakers.
In the now-viral SNL sketch, Gosling and Day play two men who attend a town hall lecture about Artificial Intelligence, but keep distracting the lecturer (Kenan Thompson) by how similar they look to the cartoon characters -- despite both men claiming to be unfamiliar with the show at all.
The sketch was bolstered by the excellent makeup and costuming, but what really made it a hit with fans was the way in which Gosling and Day made every other cast member break character by laughing -- most notably Heidi Gardner, who burst out laughing and was unable to contain herself when she first saw Day as Butt-Head.
One aspect of Gosling's three times as SNL host that really seemed to resonate with fans is the actor's inability to keep it together and keep himself from breaking into fits of laughter.
ET's Denny Directo spoke with Gosling's co-star, Emily Blunt, at Tuesday's premiere, and the actress said he brought that same vibe and energy to the set of The Fall Guy.
"Yeah, I mean, I think we're both really weak in that way," Blunt said. "I don't know if we're very good at holding it together."
"But I like working with people like that," she added. "It makes it more fun."
The Fall Guy -- co-starring Aaron Taylor-Johnson, Winston Duke, Hannah Waddingham, Teresa Palmer and Stephanie Hsu -- hits theaters May 3.
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