[Sans gives a pretty undignified snort right along with her until he pulls away and tucks the whoopee cushion back. Then he shrugs.]

Aw, thanks. My brother's aiming for the Royal Guard, so I gotta make a good impression. I heard insomnia's a big problem in the Guard, though. There's a lot of sleepless knights.

[Insert rimshot.]

Anyway. You kind of have to respect your superiors anyway. Especially queens.