You got a new haircut.. You looked like a whole different person! You don't even know if your roommate would still recognise you. He kinda has a hard time recognizing people.

You stopped by the store to buy some groceries.. Also buying Luffy his own stuff since he always says to buy him food..

You got home and opened the door.. Luffy was sitting down on the couch while watching TV.. He didn't know you were gonna change you're hair color. He looked at you and said

"AH! WHO ARE YOU!"