Remote berry feeding against some Mystic account-sharing bastards who were trying to monopolise the area with blue. My gym was the only yellow in a sea of blue gyms.
I saw them (their usernames in the gym, not in person) just take down a Valor gym down the road, and I already expected the attack coming to my gym next. True enough, the attack came 8 minutes after they took over the Valor gym.
They had 4 accounts, but apparently had bad attacking strategies, sweeping all 6 at once 2 by 2, instead of targeting only the first Blissey, and did not know about the sync attack trick. (That's despite one of them "showing off" a perfect IV maxed legacy SC/SB Gengar in coincidentally the same gym, a few days ago).
I could continuously feed berries for 30 minutes, even 4 on 1, without hitting the berry cap.
It was really fun feeding golden berries against them.
Then a multi-accounter who I know, with 3 accounts in the gym, started feeding too. I had to do other things, so I left the feeding to him.
Another 30 minutes later, the gym was still standing with the same 6 defenders, and with a lot more berries fed than before. And the gym was still under attack!
Blue monopoly? No way.
Also if I could afford the time and healing items, I would have went to attack their first gym to distract them while the multi-accounter was feeding mine.
Edit: My Dragonite just returned from the gym. But the gym is still yellow, and I still received coins for today. That's good enough.