His shopping cart had more stuff loaded on it than i have in my entire apartment. As he pushed it down the street, he yelled continuously. He yelled at cars, he yelled at other people, and he yelled to himself.
I was walking one of my dogs when we caught his eye. From across the road he yelled out, "What kind of dog is that?!!"
I wasn't close enough to him that he would have been able to read my lips, so i just gave him my usual "i don't speak" gesture.
He responded with a quiet nod and gave me a thumbs up. Then he placed his index finger to his lips in a librarian style, be quiet way and quietly continued to push his cart along the sidewalk.
A few minutes later i could hear him yelling at some construction workers about a block away. He was yelling at them to "Shut the f*ck up!".