Charlie Day Reveals The Dark Side Of 'Pacific Rim' Director Guillermo Del Toro

If you've ever seen an interview with "Pacific Rim" director Guillermo del Toro, you probably know that he's a super nice guy. Always enthusiastic, always cheerfully geeky, Guillermo is the best. But is there a dark side to the director?

When MTV News' Josh Horowitz sat down with Ron Perlman and Charlie Day to talk about "Pacific Rim," he couldn't help but ask if del Toro ever lost his cool, nice guy vibe. Perlman, who has worked with del Toro on numerous occasions, said that he's like family, so they've seen all different sides of each other.

"Guillermo and I have seen each other at our best and at our worst. We still adore each other. It's like we're real family," Perlman said. "That's what happens in families. We're together so much in so many different circumstances that sometime it's just going to get stupid, and sometimes it's going to be sublime."

So even if Perlman wasn't willing to give us some dirt, Day saw some darkness and wasn't afraid to share.

"I saw a dark side. Can I say?" he asked Perlman. "Guillermo's a big hugger. He loves to hug you and bring you in, and every now and then, I'd come to the set, and he'd be like, 'Hey, bro' and be hugging me and squeezing me. Then he'd say 'I have the worst flu, man. I am so sick. I'm so sick. It's terrible, man.' That's his dark side. You want to be in that bear hug when he's healthy. 'I'm throwing up, man. This is the worst.'"

"Pacific Rim" opens in theaters tomorrow, July 12.