Still somehow the most scientifically accurate scene in Furious 7.
New Line Cinema
Wait, where's the traffic? This movie's title is bullshit.
Damn, we suppose this is why you shouldn't keep grenades in the house. One of the many stray bullets that you encounter during the day could set them off.
Why It Wouldn't Work:
As the star of an action movie, it may surprise you to learn that grenades are more than little metal balls filled with explosions. They contain a complex chain of features intended to make them blow up when the grenadier intends, and not at any other time. Releasing the handle sets off the striker. The striker hits the percussion cap and creates a spark. The spark lights the fuse, which burns for a few seconds until it, in turn, ignites a small amount of detonating fluid. That goes off, creating a very small explosion, which then sets off all the explosive material inside the grenade, called Composition B.