At this point in their "Twilight" careers, the lead actors are so comfortable in their roles that it's difficult to imagine a time when Kristen Stewart, Robert Pattinson and Taylor Lautner ever felt awkward or anxious during filming.

However, in walking down memory lane with the trio, we've learned that Stewart suffered an "excruciating" headache on her first day, Pattinson pulled a butt muscle, and Lautner was in a fight with that long, luscious black wig he wore.

"The wig, it was a very important co-star. Right now I'm not missing much," Lautner joked about not having any warm, fuzzy feelings for that particular hair accessory. "There was hatred between both of us. It did not like me, I did not like it. Not fond memories."

On a more serious note, Lautner said he battled his share of nerves in coming to set, because he was the last to arrive.

"The first one, I was probably nervous. I came in halfway through filming so everyone already knew each other, it was a big party, and then I came in being the youngest, and I was pretty nervous," he recalled. "But it quickly ended up being fine. The first one was strange, but for 'New Moon,' that's when we got rolling. It was satisfying and exciting," Lautner said of fighting for and winning his spot in the sequel after [article id="1626538"]Jacob was nearly recast[/article], "and I was much more comfortable with everyone and in the role."

[article id="1697076"]"Teen Wolf" star Tyler Posey once had a shot to play a different wolf -- when he auditioned for Jacob Black in "Twilight."[/article]

While we're on the subject of fond "Twilight" memories, we enjoyed Pattinson pointing out the fact that he got a little handsy with Lautner while filming "Eclipse."

"I remember grabbing your boob all the time in this one," Pattinson said to Lautner.

"I remember he had to, like, stop me every time," Lautner said, mimicking Pattinson copping a feel. "And you were doing it hard."

Ah, memories.

Check out everything we've got on "The Twilight Saga: Breaking Dawn - Part 2."