I work in video production.

I was originally commissioned to do animate some Photoshop files for a minute and thirty seconds as a demo for investors. The scope changed slightly at our first meeting, when he asked me to make some changes to images prior to animating them. I gave him an estimate on how much I thought the changes would cost based on what he told me.

Of course, the Photoshop editing goes on way longer than I had anticipated. At our next meeting, I told him so and gave him some options:

Me: So, either we can set up a payment plan for these edits because they’re proving so time-consuming, or we can scale back on the animation to stock to the original price point. Which would you prefer?

Client: Ok, that will work.

Source: Clients from Hell