After Underfell Sans becomes furious at the costumes donned by Swapfell Sans and Underswap Sans, he shouts out in fury that those aren't costumes. When Underswap Papyrus and Swapfell Papyrus reveal that they made the costumes, this causes Underfell Sans more rage. Underfell Sans implodes, telling Underswap Papyrus and Swapfell Papyrus that he's had it with both of them, and then talks some trash about their brothers, Underswap Sans and Swapfell Sans. This causes both Papyrus's to get livid, and they each grab Underfell Sans and prepare their revenge
Source: http://spacejacket.deviantart.com/art...
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