Jason Momoa is tight-lipped. Sure, the former 'Game of Thrones' and future 'Batman v Superman' star is happy to be on 'Jimmy Kimmel Live' to chat it up with professed big fan Jimmy Kimmel, but he's not going to let anything slip about the worst kept secret in Hollywood right now -- that he's playing Aquaman in the next major DC comic book movie. Admittedly, though, he sure looks nervous about it.

In his defense, though the gig is all but officially announced by Warner Bros. and DC, Momoa is probably under contract to keep his mouth shut, so it's no wonder he keeps trying to avoid the topic. One thing that he is not nervous to chat about, though? The gruesome and kinda weird death of his beloved 'Game of Thrones' character. Sad? Sure, but not nervous -- probably because Momoa has some fun history to back up what happened to Khal Drogo.

More From ScreenCrush