Leisure suits. Mine was forest green and I wore it with a butterfly bow tie.
As I mentioned before I was a Hot Wheels guy rather than Matchbox. I had the case the looked like a tire that you opened up to put all your cars in.
I also had the track that had the little machine that the car would go through that had spinning rubber wheels inside it that would shoot it down the track. I think they were called "Superchargers" or something.
Also, who else had baseball cards that would today be worth four figures, but for the fact that you clothes-pinned them to the spokes of your bicycle to make your bike (sort of) sound like a motorcycle.
Which reminds me...only the old guys on here probably remember what clothes pins were actually used for.