which I had as a kid. And then I remembered the Smash Up Derby cars, which I loved almost as much.
And then I thought about the little plastic snowflaky-linky things that we'd make 'cars' out of and smash into each other until one of them had been reduced to its component atoms.
These seem to be contemporary Chinese knockoffs, but they get the idea across.
But my GIS ["plastic snowflake link together 1970s lego toy"] also brought me this.