I used to have a wimpy air pistol. Great for an apartment, it was pretty weak.
Danged if a bb didn't bounce off a piece of corrugated cardboard and come right back and hit me in the face.
Even though it was more of a pain and slower, I stuck to loading darts for a while after that. They stuck in the cardboard.
Styrofoam is a danger, too—BBs can fly back at you with almost the same velocity.
Blackpowder, flint and lead ball—NOW THAT’S REAL SHOOTING!!