OK, let's do a test. You stand 15 feet (home defense range) from me in your winter coat and I'll shoot you with a 12 gauge using #6 shot.
In fact, you're more likely to get bouncers with bird shot and take out your own eyes.
I'll also be happy to help with the "bounce test" in a dry walled room. I'll shoot at the dry wall in your house with my 12 gauge. If I lose an eye I'll pay for the dry wall damage.
Make light of it all you want, it has happened. Use bird shot for birds.
I'll shoot at the dry wall in your house with my 12 gauge.
Have any radiators? How about window cranks? Nail or screw heads? How about nail plates(to protect pipes or wiring) in your dry wall? Small, light shot can and will bounce. Spend any time at a range, indoor or out, with someone shooting birdshot and you will get hit by bouncing shot eventually.