(So I found some pretty sweet art for this xD Credit goes to DisguisedHypnotist on DA)

SepticSand: Hey Papyrus, did you know that your brother could be a ninja? Because laziness gives you ninja skills :3
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WHAT!?

HOW WAS I NOT MADE AWARE OF THIS!?

AND WHY CAN I ACTUALLY PICTURE IT!?

"Sans, the laziest ninja in all of the Underground!"

...

Wait a minute... Is that why he can teleport!?