Anyone else have some badass exploits to share?

I remember that my crew and I used to do some of the craziest things when we could. When the player count was rapidly dropping, and nobody seemed interested in taking on BK at the time, I decided to kill it myself. Just a lone Mammoth with an absurdly strong build. It took three hours and lots of deaths. By the end I had gathered a couple of spectators by way of a nighthawk and a firefly. It was a hard fight, but damn am I proud I did it.

Sertao or Coral Forest BK? Because the former I only killed a handful of times, while the latter I may have spent a few hours doing a kill group run on and I'd love to hear more details either way.