It is absolutely amazing how many different uses you can get from regular household items, like a pillow case and a louisville slugger.
Ambush him in the dark, insert head into pillow case (BEFORE HE SEES YOU!), Don't say a word because he will recognize your voice and finally give him a good swat in the ribs. Not in the head because you can wind up in prison for life, manslaughter. Break some ribs, he'll get the message in his hospital bed.
Lastyly, don't brag about it! Shut your mouth and all is good.
Just an opinion. Sometimes our current justice system just isn't good enough. They never seem to punish the right people enough.