Derpderp243 dares: SWITCH-A-ROO! Pap and Sans switch, Toriel and Asgore switch, Frisk and Chara switch, Alphys and Undyne switch, Mettaton and Blooky switch, Flowey and Asriel and yeah!

Papyrus: Oh no. I feel the puns taking over my mind. AHAHHHHHH! I'm not... bonederful.... Nooooo
Sans: I can't stop nyehehehing! NYEHEHEHEHEHEHEHEHEHEHEHEHEHEHEHEHEHEHEH...........
Toriel: well. This isn't very nice.
Asgore: wow! I have boobs!
Frisk:...........
Chara: why do I have a toy knife?
Alphys: *sniffs hair* I-I've been wanting to do yhis for many years
Undyne: You're so short, Alphys!
Mettaton: oh yes!
Blooky: Oh. I'm not up for this right now