Most customers are wonderful, but its always the worst ones that you remember for years to come... So lets lament together!
I always think back to one of my first ever illustration commissions. I was just a kid and got a message from someone on my old social media. They wanted something I probably shouldn't say on this kind of website. They framed it as an inside joke that they wanted to share with friends however, and being the extremely naive child I was back then, I happily accepted it. Suddenly after this commission I was absolutely swarming with creeps asking for similar "material" to the point it got so bad I ditched the account entirely. Nowadays I cringe thinking out it and how obvious it is now that I shouldn't have accepted the first one. Live and learn though.