Yeah... Looks, and sounds...! [He's not just repeating what Sans said, but clarifying. He has so many clips of Undyne harassing him and going in to noogie him, his own voice - maybe slightly enhanced with coolness - protesting.] And smells, and tastes... Those, uh. They didn't fit on the phone. Don't mess with the tower, okay?

[It may be an unnecessary demand, a rude accusation to hint at even with the knife situation. But he's realizing he wants to backup the backup, and hide the recursive backup somewhere that a hypothetical future Papyrus who doesn't care might not think to look. It'll take a costly external hard drive, as the files get ridiculously large when he tries to record long stretches of memory with all the details he could cram in... No wonder his physical memory got overwhelmed, trying to memorize things. And sprouting more computer stuff in his skull. Maybe he could upgrade his body, just in case that ever happens again...?]