PM: I need a brand new feature that we haven't had before and it has to have a framework backing it so that we can extend it to anywhere in the future. It also has to have X, Y, Z, it has to be able to tell the future, cure cancer, fly, and have a return on investment for us of 1000x. How long will that take?

Me (or any dev ever): Umm... well, that's kind of asking for the moon. The first few pieces will take as least 5 sprints. When do you need it by?

PM: Tomorrow. When can you have it?

Me: ......