You can’t milk those!

I once played a one-shot where someone suggested we go full evil party and the DM accepted. He was kind of excited even. We’re usually very keen to help every NPC that comes asking for help. But this time, as an evil party, we had ulterior motives. We agreed to help, but for a price! We didn’t kill anyone. My character ended up turned into a flesh golem or something. Probably the kindest evil party ever.