When you do a lot for someone and they don't appreciate it and talk down to you it's VERY hard not to go off on them. I deal with that a lot with my job and there are days I want to punch a hole in the wall out of frustration. Thankfully I just picked up a punching bag at a yard sale for $10.
I once bought a punching bag from a yard sale. There were some odd bulges in the side that turned out to be free weight discs... as in, cast iron. The (expletive deleted) who sold it to me neglected to tell me that. Fortunately I wasn't the one who punched that particular part of the bag and nearly broke his hand, leading to the unpleasant discovery of said weights.
Did the mounting hardware come with the bag? Those things can be a pain to set up without a stout chain and a sturdy joist... and a strong assistant.
