[If nothing else, decades of knowing him have certainly given Sans some insight into ways to rile his brother - or at least bait for luring him into their usual bantering patterns. Papyrus scoffs and turns to frown at Sans as they walk, though his face remains obscured by the expressionless mask, and he's still speaking slower than usual in an attempt to minimize the pain of it.]

Hey, weren't we... not using electricity? Unless, you just mean, as unlit wires. Which is... a big waste of good lights. [Honestly, Sans, have a little appreciation for those lights. Decorative, defensive against random light-fearing weirdos...]