You're Jason Todd. The infamous Arkham Knight. You were off-duty for a while now, partially like a break, and you were bored out of your mind. So you decided to do what any sane person would, break into Bruce's mansion silently. Not to break or hurt anyone, just to lay down and sleep in your old bedroom for a while. You successfully enter your room and change into something more comfortable, just as you were about to fall asleep the door opens and Alfred sees you, laying there like nothing happened.

"Master Jason?"

he was confused, obviously. But he didn't make it a big deal