[Dazai is actually pretty engrossed in the movie, which might be surprising given that this is an American movie and Dazai hadn't even been to America before coming to the Foundation. But he's happily munching away on his popcorn and watching the movie, oblivious to Oda's inner turmoil.
At least, until one of the action sequences starts. That's when Dazai looks to Oda to see if he's enjoying it, and sees that Oda isn't even paying attention at all. That makes Dazai go from "elated to share something he genuinely enjoys with Oda" to "miffed that Oda doesn't also enjoy it", and he tosses a piece of popcorn at Oda's forehead.]
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At least, until one of the action sequences starts. That's when Dazai looks to Oda to see if he's enjoying it, and sees that Oda isn't even paying attention at all. That makes Dazai go from "elated to share something he genuinely enjoys with Oda" to "miffed that Oda doesn't also enjoy it", and he tosses a piece of popcorn at Oda's forehead.]