Sans fell victim to a not so normal brownie.

Agent0Fluffy as Underswap Papyrus

Mr. Amazing VA as Blueberry Sans
https://www.youtube.com/channel/UCXzPqMjGjGiw91RQl2JkD9A

Comic by thelittleblueonesart
http://thelittleblueonesart.tumblr.com/post/145622622103/holy-smokes-thats-a-looooong-post-so

Music belongs to Episdemic sound and kevin Macleod