From anime short and long, we have characters that are nothing short of detestable. They're the epitome of scum and villainy. We hate them and can't wait for our heroes to give them the asskicking they so rightfully deserve.
Post the punches that you consider to be the most satisfying. Here is mine.
Hajime no Ippo is an anime about extremely satisfying punches, even if it doesn't quite fit in with the purview of this thread.
Gemma in Ninja scroll
Luffy punching the Celestial Dragon