Why don’t Bruce Banner’s pants rip open when he turns into the Hulk?
BEST EXPLANATION: It’s an old question, probably asked right after Bruce Banner first transformation. And one with a fairly obvious explanation: Because nobody really needs to see Hulk-junk.
The “official” answer comes from Hulk co-creator (and comics legend) Stan Lee. In an interview with Vanity Fair, he said: “I just figured that Bruce Banner had probably been a friend of [Fantastic Four leader and all-around genius] Reed Richards, and Reed had given him some elastic trousers. There’s an explanation for everything, but you may not be technically advanced enough to follow me on all of this.”
[youtube=http://www.youtube.com/watch?v=XjjDGLTz8yc]