[There is a brief moment where the two of them are just staring each other down in utter confusion, except during the silence on Eric's end he is thinking Yeah right, this is the most obviously suspicious person here, who does he think he is fooling? He's probably about to cop up to his lie right now because this furious glare he is giving him must be just that intimidating. ....So he's put out for a second when he comes out with that instead.]

... Huh?

[What is he supposed to make of that? Give him a second to figure out how many shades of indignant he should be.]

That's... stupid! Obviously everyone here is human. Am I supposed to believe you're a real talking skeleton? Cut the crap!

[He moves in, making a broad grab for Papyrus's scarf and hopefully a shirt collar underneath it, preparing to threaten him with his fists. But before that actually happens, he blinks.]

What, you're crying?

[Why? How!?]