Superman: The Movie came out all the way back in 1978, featuring a photographer for the Daily Planet called Jimmy Olsen, and the actor who played Olsen, Marc McClure, is actually having a cameo in Justice League, as reported by CinemaBlend.
In his cameo role, McClure is a random Metropolis police officer who is saved by Cyborg, and you can see these two in action here.
Justice League is coming next month. Do you have fond memories of Jimmy Olsen?