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