One thing that I haven't seen mentioned and you all probably know but bears repeating----don't get it pointed at ANY part of your body. Seems like a no brainer but you would be surprised how many people think it won't hurt them.
Aiming it at the dog isn't a good idea either. However, my George (a Boston Terror) loves it when we have it pointed at the concrete patio in back. He plays in the spray shooting back up.