Firstly, if you "don't mean to be rude" then don't say stuff like "you are full of it" or people might question your sincerity ;-)
Secondly, what you describe is warm up not burn in. "Burn in" would be a change that occurs after x time of use and is then persistent/permanent regardless of other factors. "Warm up" obviously is a change that occurs as the item warms with use and which is lost when the item is again used from a cold start.
The only sane examination I ever saw of the supposed burn-in phenomenon in headphones was by Tyll at Inner Fidelity and he pretty much demonstrated that the changes observed were related to temperature changes, not permanent changes in physical or electrical properties.