"[It] was really bad," Rudd recalled. "It was a double date. A buddy of mine and I went out with two girls -- many years ago -- and the girls didn't, quickly we realized they were not that interested in either one of us and we thought it would be funny if we just start making each other laugh. And each guy just kept trying to outdo the other guy with just silly things."
While driving home from the date, Rudd said he thought it would be really "funny" if he just got out of the car and ran alongside it. "I wasn't driving fast obviously, but even when you're driving slow...it's really fast," he said.
"As she was talking...I just stepped out of my car to run and I hit the pavement so hard," he continued. "My hands were all cut up. My pants were torn. I limped back to the car and they were all ashen face...and then we just drove home very quietly."
Rudd was also asked by Norton give his opinion about a popular, yet completely ridiculous fan theory about how the Avengers will defeat Thanos in the film.
"A lot of people have asked me recently if I shrink down and go --- the theory is called the Thanus," Rudd said. "And go into Thanos, in a certain orifice and then grow giant sized."
"Why not the ear or the nose?" he joked. "It makes total sense!" Norton replied and Rudd added, "Scientifically you're right."
Later in the show, the three men bonded over the difficult task of not revealing spoilers for either of the popular projects. Rudd and Hemsworth said hiding secrets isn't really hard for them, as neither of them have seen the movie.
"I'm just good at forgetting stuff, which helps," Hemsworth said, as Rudd added, "We haven't it and there are many things that we don't know because we didn't read the script. That's not even a joke."
Hemsworth, who apparently is a "GoT" fan, asked Harington if they could "swap endings." Chris joked, "If you tell me yours, I'll tell you mine," before Kit agreed.
While we doubt they actually learned any details, Harington said he has told one person in his life how "Game of Thrones" ends. See who the lucky friend was in the clip below. "Game of Thrones" premieres Sunday, April 14 at 9 p.m. on HBO and catch "Avengers: Endgame" in theaters April 26.