First kisses are universally awkward—especially if they’re on camera. Just ask Zac Efron.

The 31-year-old Extremely Wicked, Shockingly Evil and Vile star stopped by The Graham Norton Show today, where he took an unexpected trip down memory lane and reminisced about his deeply embarrassing first on-screen kiss.

It all started when fellow guests Charlize Theron and Seth Rogen spilled details about a rather unique sex scene they share in their upcoming film Longshot. After they dished the deets, Norton, 56, turned to Efron and asked what his first on-screen kiss in the 2004 teen drama Summerland was like.

Shocked, Efron asked, “How do you know that over here?” Norton explained that he really does his research, and Efron went on to share why his first on-screen kiss basically scarred him for life.

Summerland was the first show I ever was on and it was my first on-screen kiss. I think I was like 16. And I was very nervous—I still get nervous to this day…I wanted to make her feel as comfortable as possible.”

Unfortunately, he wasn’t quite successful in achieving that. Why? Well, as Efron explained it, “They served fish…It was a catered lunch and my mom was freaking out. We’ve never seen this much food. It was insane. So, I just went to town…I had crab, I had salmon, I had all this stuff. And next was the kissing scene.” Uh-oh.

Efron went on to say that he went in for the kiss, but instead of co-star Kay Panabaker’s lips, he got a full serving of shade.

“All of a sudden I hear, ‘Oh my gosh, did you have salmon for lunch? Seriously?’ And I was like, ‘Yeah.’ And it ruined the first kiss,” he remembered. “I learned a big lesson that day.”

Now, Efron always brushes his teeth before doing pretty much anything. He even pulled a mini toothbrush out of his pocket for proof, and Rogen backed him up, saying Efron had been brushing his teeth backstage.

The more you know…

You can catch the rest of The Graham Norton Show tonight on BBC America at 11/10 c.

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