I remembered!

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Back when I used to play Animal Jam 24/7 (I barely play it now oof) one of my buddies was quitting the game. So, they gave away some of their stuff.
The two things I got were both masterpieces, one of a wolf(?) in glasses and a tail item.

The other thing was Sans, because haha funny bone man-

But now that I remember this... That masterpiece of Sans didn't look exactly like him.
Now that I have a general idea of what Undertale is, I can confirm...

I WAS GIVEN A MASTERPIECE OF AN AU SANS AND I DIDNT EVEN KNOW IT.

AND IT WAS NIGHTMARE (I think)

I don't have a picture of it, and I dunno if I even have it in my old den anymore, but whenever I decide to open Animal Jam again, I'll take a picture of it.
Oh, and also...

MissUnpopularOpinion

Cmere.

Nightmare Sans? In MY Animal Jam? It's more likely than you think.

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