It's not hard to see that Chara's energy is bubbling like a bottle of soda fresh from a tumble drier, fit to explode at any moment. In what way, Sans isn't sure.

So he continues.

"Y'see, when you put that coat on, it instantly teleports you to a land of untold comfort. When Pap was little, he called it Hoodietown, n' if that doesn't sound like a rad place to be I dunno what does. You just put it on, zip it up, n' pull the hood over you and--augh, kid, wait!"

They don't turn around, and Sans gives up the chase two steps in. His jacket lays on the ground, right where he left it.

"... Damnit."