[Ahahaha, what is he doing? That's such a rookie mistake. Of course, Mettaton doesn't take it too hard.

...That is a lie, he looks appropriately perturbed that he'd let that slip.]

Well, I'm not omnipresent, but I--that is to say! I'm a ghost who likes people-watching and it's especially easy to people-watch when others can't see you!! It's hard not to remember such an interesting personality as yourself!

[Believable? You be the judge, Tony.]