[ Just a smile at that... He really can't help it, but he can imagine it'd be awful to be forgotten. If Luffy or Chopper suddenly forgot who he was, he'd be devastated.
In any case, he'll just change the subject and be friendly to his new friend. If he can say that already. ]
Say, do you know how these things work? The things we're talking on. [ Tapping it with his fingers. ] They're really amazing - like a Den Den Mushi without the Den Den Mushi. I've never seen anything like it!