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The hilarious clip was accidentally captured on the morning news show, when the two presenters were speaking to a young roller skater called Daisy.
Sharing it on social media, a Twitter user wrote: "A surprising view while interviewing little Daisy."
She tagged in Dan Walker, who was presenting the show at the time, who then shared it with his own followers.
In the clip, Dan, who is commenting on Daisy's skills, can be heard saying: "I wouldn't be surprised if we are using this footage for many years to come."
Another follower replied to the tweet saying: "How you and @sallynugent didn't crack up laughing I do not know because I just sprayed coffee across the room."
Another joked: "Was it Piers Morgan trying his best to get back on the telebox in the morning."
It's not known who the mystery photobomber is.
TikTok user Betsy Jasper (@malibu_betsy) had originally shared a video on the platform, explaining that she'd been looking through old photos from a trip when she stumbled upon an amusing background detail.
She wrote: "So I was scrolling through old photos and came across this guy who photobombed me in NYC. Anyone know who he is?"
It turned out that someone did know who the mysterious person was - in fact, the man himself came forward in the comments section.
A user called @fitonahmeti replied, saying: "That's me," adding two crying with laughter emojis.
Betsy wrote back to say: "Prove it."
And it looks like he did, as she's now shared an update to say that the two of them have now met up.
In her second video, Betsy said: "Three years ago I was photobombed in NYC by this guy. Wondered who he was for years.
"Posted this video on TikTok and found him. Thanks everyone for your help."
Speaking to LADbible, Betsy said she and her mystery photobomber - a man from Albania called Fiton - have not only met up since the revelation, they've also been hanging out on a weekly basis.
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