OMG, it's amazing how much awfulness is out there. If it serves no other purpose, this thread has motivated me to give my dd a few extra kisses today.
The worst thing I've ever seen: a group of adults and kids walking down the street near my apartment. The adults are all talking at the top of their lungs. One of the kids, a boy around 4 or 5, runs a little bit ahead of the adults (not dangerously far and not close to intersection or anything) and starts calling back to some of the other kids. One of the women responds by screaming, at the top of her lungs, "Get your a$$ back here and shut the f*ck up!"
The ironic thing was that the adults were the ones making all the noise.