They're Not Magic?!: How Grenades Work
This is a little informational graphic explaining how grenades work. And don't worry -- you're not the only one who thought there was an explosive genie trapped inside. I'm right here with you. Which reminds me, did I ever tell you about the time a group of ruthless terrorists lobbed a Molotov cocktail at me? I caught it, pulled the flaming rag out and chugged that shit like grape soda. Just sayin', you ever seen terrorists cry? I have.
How Grenades Work [gizmodo]