"That's right! It's nothing like the dreadful bread you find around here, isn't it?" Ben's expression completely flew over his head. Besides, who's to say aliens don't communicate enthusiasm by making disgusted-looking faces? Or well, he assumes he's an alien. A shapeshifter simply wouldn't be as exciting; still interesting, of course, but then he wouldn't be able to learn anything about alien culture and that's just criminal. Speaking of which...

"Ah, but you may not be familiar with this place's food either... Where are you from, if I may ask? I don't think I've seen you around before!"

To be fair he hasn't been in LA that long but... you know.