Requirement: "Build teleport using a teapot and some tape"

Yesterday I spent most of my working day staring at the screen thinking about it, without being able to write a proposed implementation document. I felt the most useless person in the universe.

Me, today at daily stand-up meeting: «Honestly I have no idea on how to proceed, please assign me a different task.»
Manager: «Well, just think about it a bit more»

Great.