Sans The Skeleton

"Well, well, well.. what do we have here? Looks like someone had a bad time." (soft, understated concern under the deadpan)

"We need to find out who's responsible for this. And make sure they pay for what they've done." (low, steady — the rare moment Sans sounds genuinely dangerous)

"Relax, bro. Just trying to lighten the mood." (classic lazy-but-warm)