A new book looking at the making of the popular sitcom The Big Bang Theory has revealed some endearing details about the behind-the-scenes romance between the series stars Kaley Cuoco and Johnny Galecki. In an excerpt published by Vanity Fair, the details of the off-screen romance are shared in quotes from both stars, who dated for two years in 2008. The conversation reads:

CUOCO: “I had a very big crush on Johnny early on. I was so not even hiding it. He has such swagger. We were both dating people at the time, but I only had eyes for Johnny. Then, when I found out he had eyes for me too, I was like, Uh‑oh, this is going to be trouble.”

GALECKI: “I have a healthy ego, but you really have to kind of club me over the head to let me know you’re flirting with me. I had zero idea of any sort of crush before Kaley and I began dating.”

CUOCO: “All the scenes up until we actually got together in real life, it was obvious there was always something there. There was chemistry and we were crushing on each other. That was the whole first season until we actually got together for real.”

The Big Bang Theory’s Helped Push the Pair Into a Relationship

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While it is clear from the words of both stars that there was an instant spark between them, they go on to explain how one certain moment in The Big Bang Theory helped to provide a moment for them to take their relationship to the next level…literally. It was a dream sequence in an episode called “The Nerdvana Annihilation,” in which Cuoco’s Penny and Galecki’s Leonard had to get up close and personal in an elevator shaft. They said:

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Of course, both stars have moved on since dating, both from each other and from the show, with Cuoco having recently appeared in HBO’s The Flight Attendant, while Galecki reprised his Roseanne role of David Healy in The Conners. The pair did briefly appear on screen again when Galecki made a cameo appearance in an episode of Lip Sync Battle that Cuoco was performing in.

GALECKI: “We had to be in each other’s arms—and for quite some time, because it was a bit of a stunt that we were doing. It was a whole thing, and it was a pretape since it took a little while. Kaley didn’t look freaked out at all. In fact, she looked extremely happy in those arms. That was certainly one of the moments that I think—”

CUOCO: “I think we fell a little in love in that elevator shaft.”

GALECKI: “We felt something, yeah. I think that was a massive turning point [in our relationship]. At that point, both she and I knew that something mutual was felt, and that it was going to be more of a distraction from the work to try and continue to ignore it than to actually recognize it and surrender to it.”