If someone is sick or has a sore throat, recite the following:
Sans: Aw, Paps. You don't sound too good today.
Papyrus: Yeah... I think it's allergies...
Sans: Oh, then are you allergic to dogs or corn?
Papyrus: .........Why--
Sans: 'Cause you sound a little husky!
Papyrus: ಠ_ಠ
Sans: ¯\_(ツ)_/¯
