it can possibly happen with how a large sum of teenage girls are in society today. alot follow fads without even thinking... and they love orlando bloom... ALOT... so i think it could possibly happen
everyone breathes - it's an instinctive physical reaction (there's a scientific / medical explanation thingy for this behaviour "involuntary.... something" - but I can't remember what it is... lol)
anyway - most ppl have no choice - even if you hold yr breath, eventually you pass out and start breathing again automatically
*Edit: I just remembered, I think it's called an Involuntary Reflex - it means you can't help it - your body just keeps breathing whether you think it's cool or not