I have lived in two neighborhoods with HOAs. I don't anymore. Here's my story:
1) Very shortly after I moved in at my first house, I kept finding dead animal carcasses on my front lawn. Flattened rabbits, chipmunks, squirrels, possums, stuff that the local population would usually eat but somehow wound up on my lawn. This resulted in my first HOA warning letter. One day I took off from work and waited for a furniture delivery, and I happened to catch a neighbor (that I hadn't yet met, I had just moved in and didn't meet anyone due to my horrible work schedule) scraping up roadkill with a pitchfork and lobbing it into my yard. I waited until he went in his house, went out, picked up the carcass and shoved it in his mailbox. Didn't have that problem anymore. Found out years later he was feuding with the former owners.
2) Back when I lived alone, I used to go on lengthy business trips. I got back from a 4-week trip to find a mailbox full of fines for "parking on the lawn." $50 each. The license plate on the fine wasn't mine, so some goomba was parking on my lawn while I was away. Phone calls didn't work, so I wrote "deceased" on the fines and shoved them in the resident HOA snitch's mailbox
3) Got up on a Sunday morning and heard noises in my back yard. The resident HOA snitch (angry elderly woman) was in my back yard with a clip board and digital camera. I went out back, asked if I could help her. "I'm allowed to be here, I'm with the HOA. Go back in your home" A verbal argument ensued, and she didn't leave until I said I was going to physically remove her from the property (using a wheelbarrow). I got a fine in the mail for altering runoff water flow. The poor grading when the crappy neighborhood was built caused the hill to erode and changed direction up against my foundation. I fixed it, which resulted in my neighbors yards not being turned to red clay mud every time it rained, so I got fined. Fought that one too
4) I went to use the neighborhood pool with my RFID key card. One of the HOA gremlins was in the pool area, ran up and slammed the gate shut in front of me, accused me of "duplicating keys" and threatened to call the police since I "wasn't a familiar face." Lady, there's 300 crappily built houses in this crappy neighborhood, and you expect to memorize every face? She called some other pot-bellied goblin, who showed up in a gawk-cart and demanded to see my driver's license to prove my residence there. Meanwhile, mini-vans filled with kids were entering the parking area from outside the neighborhood and going in through the other gate.
5) Neighborhood drunks kept driving across my lawn, destroying my mailbox and flower beds. I got a few fines in the mail for "unsightly appearance" when I could not get to repairing it quickly (especially if I was on a business trip). I got sick of this, so I bought some landscape timbers and 10" gutter spikes, made spike-strips and buried them under the mulch. Not long after, some drunk drove through, picked up the spikes, annihilated his fender, shredded multiple lawns, and crashed into the transformer box up the road. He got arrested. Police asked me about my "spike strip" and I told them it was just landscaping timbers to hold my mulch in place (technically true). I got a fine in the mail for "unsightly appearance" again.
6) I got a fine in the mail for "unsightly appearance" of "uncut grass." It was ornamental grass along a steep hill between properties, and it wasn't even on my property. The HOA gremlin had to come out to "assess" the property line. When she realized I was right, she said nothing and just left.
And I saved the best for last...
7) I got a bizarre letter in the mail stating that the neighborhood needed to be on the lookout for mischievous behavior. Apparently a few people went out to their cars in the morning to find pizza boxes filled with human ***** matter, and more ***** matter was smeared on windows and door handles. The letter went into bizarre detail on how one resident "analyzed" the ***** matter and confirmed it was human and not animal. They blamed it on one "young man in a grey sweatshirt," but nobody questioned how one "young man" could produce such a volume of ****. It had to have been a whole gang of phantom crappers.
I called a realtor within 24 hours. The ONLY HOA I would ever consider being a part of would be a gated beach community.