It is from the episode “Shock and Oww”. A man who was tired of his house being broken into by thieves and drug addicts, set up an electrified booby trap on his window. When a thug tried to break in, he was fried and badly injured.
Denny defended the homeowner. After hiring a marketing consultant, they came up with the idea of branding him as the “American Homeowner”, fed up with crime and determined to defend his property. They kept repeating “American Homeowner” over and over in media interviews.
When it came time for jury selection, every prospective juror (including at least one who lived in a rented apartment) said that they too were “American Homeowners” and sympathized with the defendant. This forced the DA to cut a deal for no jail time.
Thanks for the synopsis.