That totally reminded me of one guy I had the honor of witnessing, who used to stand at the tram platforms by our train station, and pretended to have one of those handheld mics, and announce the arriving and departing trams.don't know about autism per se, but the joint funniest person I've ever seen riding the tram* definitely seemed to have a screw loose
there's a tram stop above the main railway station in the city where I work, and a lot of the station is open, so the automated announcements are clearly audible from the tram stop
one morning there was a young fellow waiting for a tram on the opposite platform, and I could just about hear him saying things like "platform 5B for the 08:45 Northern service to Leeds" to himself, echoing or predicting the automated announcer, or just straight-up making up announcements
he had such a good-naturedly dopey voice I could not keep a straight face had to turn the other way, and struggled not to laugh out loud
no idea what exactly was up with him (if anything), but a lot of autists like trains and timetables, so that makes it sort-of relevant, right?
* the other was a middle-aged man who legitimately sounded like one of the Stotts from Reeves and Mortimer