At almost 50 years old, I still have a very deep scar from when one of those heavy duty metal Tonka Trucks ran down an angled driveway and hit me in the lower leg. Bled like a pig and required stitches.
Yeah, that was fun, too, coasting them down the street to see how far and fast they would go before crashing. Never hit anyone doing that, though.
I also liked those plastic caps. Much better than paper caps, except that the ratio of loading time to noisemaking time was a lot worse. Paper caps were fun to ignite by snapping your thumbnail across them, making a flash and puff of smoke. Less fun when the powder would lodge under the thumbnail and burn there.