My first job I worked was for a small agency. I was kind of a young go getter and was able to very quickly pump out bad (in hindsight) yet mostly functional code very quickly.

Sales people figured out they could come to me specifically for estimates because they would be shorter than other developers estimates and more likely to get the sale. I was young and dumb and didn't connect that often times I wouldn't be the one developing the project. The other developers got angry with me after they caught on to why they were getting impossible timelines.

I started multiplying my personal estimates by three. The sales people were less than pleased and eventually started going elsewhere for their estimates as greener developers were hired.