Papyrus' end of the phone goes silent for several seconds as he pulls it away from his face and stares at it, then around his apartment. Various household items, various knickknacks, and they're all familiar. He can remember using them all at some point or another, maybe even buying them.

"You... what? You don't remember this life? Did that happen suddenly, or do you remember... forgetting things?" If remembering a past life is going to wash out this one... he wants advanced notice! A chance to get some closure, or at least give it to others.