Sounds like the perfect opportunity to give an unwilling haircut in his sleep. Make sure to get plenty of pictures of when he discovers that his locks have suddenly disappeared. [He would think to do something horrible like that to someone. He'll smirk at the thought.]

I don't know either, from what I've been told I have a rather interesting hairline, and I'm quite aware it's quite different from a human's. But I thought by now in a place such as this people were used to beings from outside their own realm of existence. You are one of the few I've met that have managed to let that idea sink in. [Was that a compliment? Yes it was. Treasure it, because it won't happen often with this grump.]

But I don't think we've met; my name is Vegeta.