The fine folks at Zembla have uncovered a rather hilarious old public service annoucement from Willie Mays back in the '60s, where he warns all the kids about the dangers of ... blasting caps.
We actually had to look up what a blasting cap was, and apparently there was once a serious concern that children would constantly be stumbling across them and setting them off. As Zembla notes, Mays' PSA must have made a real difference, because no one has ever heard — ever — of a kid dying from blasting caps. And we're still not sure what they are.
Willie Mays And Blasting Caps [Zembla]