While Paul Rudd [1] was being interviewed at Comic-Con, Mark Ruffalo [2] passed by and got so, so excited to see Paul. He mouthed to the cameras, "Is that Paul Rudd?" before staring at Paul, eyes wide. And really, who could blame him? There are a lot of reasons you can't help but love Paul Rudd [3]. Of course, this isn't the first time the actors have crossed paths. Mark and Paul were pictured together at the Tony Awards in 2006, and it looks like Mark was a little more low-key about seeing Paul back then.

See all the stars at Comic-Con [4], and watch the full video of Mark's hilarious videobomb below.