https://www.youtube.com/watch?v=7tEDuDYMDUc
If you grew up in certain areas of the country, you may have been subjected to a lot of education about the dangers of blasting caps, like this PSA by The Institute Of Makers Of Explosives. These fun-looking primers sometimes ended up on the ground near blast sites at farms, construction sites, mines, quarries, and so on.
IME sells updated ones here:
• Blasting Cap Danger (YouTube / Ella’s Archives)