Really lonely.
He knows where all the naughty girls live. I actually heard this in the video game LA Noire. Thought it was pretty funny so I bust it out every Christmas.
A Headphone
Self raising.
Robin, let's get in the Batmobile." Bonus joke: What did one orphan say to the other orphan as they got into their car? "Robin, let's get in the Batmobile."