Years ago when I was just starting in my field I worked for a small start-up company, designing their first product. The work went well, but as always in R&D there were a few dead ends which we got pushed to "try anyway" because of some mysterious reasons known only to the manager.
The conversation below happened a few weeks AFTER we (3 engineers) finished the contract and were supposed to get paid.
Me: There's been quite a delay in payment. I know the company is well funded - why the wait?
Client: Well, it's just that we`re reconsidering your payment based on your hours.
Me: What do you mean? the rate is in the contract... and frankly its quite low for the work we did!
Client: No, it's not the rate, that's fine, it's the hours. A lot of the work didn't you did didn't wind up in the final product.
Me: So you're saying that even though we agreed on this low-low rate, and did the work, and the project is done correctly and will enter production soon, and we are happy with all that, you want to ignore half our hours because the avenues you pushed us on didn't work out?
We got our payment the next day, but to this day this is the craziest thing I`ve ever been told by a client/boss/manager.