"Hi-oh Silver, away!"
Bill Denborough in IT Chapter Two. Great casting - I don't know if they cast the adults first (they're all pretty established) and then cast the kids for part 1 to match, but they all are cast great, all look like kid versions of the adult actors.
Like, I wouldn't have independently thought that Bill Hader looks like Stranger Things Kid, but they do look alike! I remember vaguely thinking that the Bill Denborough kid looked kinda like James McAvoy, but they'd
never get him, that'd be
crazy 
What's everyone's favourite scary movie?!