Following what he considered lack-luster escape-artist act, the former American Idol judge cracked a smile and, for some reason, decided to strike at both the performer and Mel B.
"I kind of imagine this would be a lot like Mel's wedding night — a lot of anticipation, not much promise or delivery," he said with a grin.
Almost without pause, Mel B picked up her jumbo-sized cup of water and tossed it on Cowell and his white, deep V-neck shirt. Cowell honestly didn't seem that surprised, possibly because he knew he crossed the line. Also, this probably isn't the first time he's been on the receiving end of Mel B's beverage dump.
AGT host and smize queen Tyra Banks couldn't help but drink in the drama, exclaiming, "This is live TV, y'all!"
Though Mel B stormed off the set, she eventually returned to finish judging contestants. After the show, she spoke with Huffington Post UK about the buzz-worthy feud, saying that she did talk to (a hopefully shivering) Cowell.
"I told him he was an arsehole," the British singer said. "And he goes, 'Oh, whatever.'"
Would she have done anything differently given the chance?
"I just hoped I would have had, like, cranberry juice in there or something, then his whole body would be really sticky," she told ET with a laugh.
Mel B also told ET that the entire episode had "a lot of emotions" due to the highly personal stories that the contestants shared. But none of the anecdotes resonated with her quite like that of Evie Clair, the 13-year-old girl whose dad has colon cancer. Mel B's father died earlier this year after battling myeloma cancer.
"When her story came up again, I'm like, 'Oh, my gosh, that's very similar to mine,'" she said. "And I wanted to put the story aside and just focus on her voice, but it all just collided."