Steve, Bucky, Natasha, Sam and Clint are discussing conspiracy theories and end up talking about the JFK assassination. Steve is adamant that it wasn’t an inside/CIA job. Natasha’s pretty sure the KGB had nothing to do with it. Clint is microanalyzing all the details like shot trajectory, line of fire, etc. Steve sees Bucky sitting off to the side Googling everything and wants to include him in the conversation, so he says, “Hey, Buck, who do you think shot President Kennedy?”

And Bucky just looks up and very quietly says, “I think I did.”

And the whole room goes silent.