scaatylobo,
With enough rounds downrange, yes indeed you can get a BB to come back at you. When I was teaching my son (then in single-digit age) to shoot with a BB gun in the basement, firing into a cardboard box full of crumpled newspapers, we had one come back and land on the table next to us, spinning like a top. It was totally cinematic. I have no idea what it ricocheted off of, since, unlike Ralphie, we were not using a metal sign as a backstop.
He immediately and forever quit complaining about my insisting on eye protection. (He's now 18 and shoots real stuff with me all the time.)