Machine Gun Kelly says he accidentally stabbed himself with a knife while trying to impress Megan Fox

• Machine Gun Kelly appeared on Wednesday's episode of "The Tonight Show Starring Jimmy Fallon."
• He recalled accidentally stabbing himself with a knife while trying to impress Megan Fox.

Machine Gun Kelly accidentally stabbed himself with a knife while trying to impress Megan Fox early in their relationship, the 31-year-old musician said while promoting his forthcoming film "The Last Son" on Wednesday's episode of NBC's "The Tonight Show Starring Jimmy Fallon."

Sporting a black-and-white t-shirt featuring an image of Fox in "Jennifer's Body" (2009), Kelly (whose birth name is Colson Baker) recounted an evening when he brushed off two bodily injuries in an attempt to show off to the 35-year-old actress.

The series of mishaps began during a beer-pong match between Kelly and Post Malone. The contestants filmed their entrance walks in the style of a "'Rocky' boxing match," the singer described. When it was Kelly's turn, he opted to slide down a nearby staircase rail.

"At the bottom of it, I didn't see a giant spike," he told Fallon, adding that the sharp object "rammed" him from behind.

Kelly said that several X-rays later, doctors informed him that he had bruised his coccyx, a triangular bone at the bottom of the spinal column. He pinpointed the injury as the reason he later collapsed off-stage when Pete Davidson hugged him on a January episode of NBC's "Saturday Night Live."

But at the time, Kelly was focused on playing off his pain in front of his new love interest, who he met while filming "Midnight in the Switchgrass" in 2020.

"This was also right when I was starting to date Megan, and I was holding it together. It was a bad night," he said.

The couple eventually ventured back to his home, where the artist said he pulled out a knife that Travis Barker gifted him to celebrate the release of "Tickets to My Downfall" (2020). The Blink-182 drummer collaborated with Kelly on the album and served as a producer.

"He got me a knife that had an engravement from the new album on it. I was like, 'Oh, check this out. This is sick.' I threw it up, and it came and stuck in my hand," Kelly said.

After he threw the knife in the air, he said he gazed toward Fox instead of keeping his eyes on it. So, the knife landed directly in his hand, leaving Kelly with a scar that he displayed to Fallon.

The artist told him: "The next morning, as soon as she left, I was like, 'Yo, I need stitches real quick.'"

"The Last Son" premieres in select theaters and on Redbox Entertainment's streaming service on December 10.