People who leave their dogs outside to bark non-stop.
We went through a no-foolin' problem with that. It got to the point that I was investigating the process for how to file suit in small claims court. Fortunately, our HOA helped a lot. We had documentation -- a daily log that filled up two small legal pads, backed up with video evidence of multiple episodes, and text conversations with the owner. The HOA fined the owner $650 -- which was a 50% discount from the amount allowed.
It's still not perfect, but has reduced to an acceptable level....for now. I still cringe every time one of them does bark and am on constant guard against a relapse. I will NOT go back to where we were -- it was miserable and truly affected the enjoyment of our home.
Because of the problem (it went on for months), the HOA amended the bylaws to make it easier to fine, especially repeat offenders.
Pineapple on pizza should be an executable offense.
Related only because it's in the food and drink arena: White Zinfandel wine is an abomination against the Lord.
Those are the same guys who would scream "you da man" at golf tournaments.
Or, "It's in da hole," on a tee shot on a 600-yard par 5.