Having a bad time has never felt so good before.
*SPOILER WARNING* DO NOT WATCH THIS VIDEO OR READ THE COMMENTS IF YOU WANT TO AVOID ANY POSSIBLE SPOILERS! DO NOT EVEN LISTEN TO A SINGLE SECOND OF THIS SONG! DO NOT ENJOY THE BONE PUNS! DO NOT DATE THIS SKELETON!
Music source:
Megalovania OST - https://www.youtube.com/watch?v=B2jVbSI9H4o
Megalovania Metal Cover by RichaadEB - https://www.youtube.com/watch?v=IMNLy67ihY4
This song is part of an officially approved fan-made Undertale album done by RichaadEB and Ace Waters (along with a lot of other guest appearances):
https://www.youtube.com/watch?v=c8ikdbG7HQY
You can buy the album here: https://determination-ut.bandcamp.com/releases
Picture source:
Sans comic by Modeseven (NORMALLY I PUT LINKS TO THE ARTISTS' BLOGS IN THE VIDEO DESCRIPTION. BUT BE WARNED. THIS BLOG IS NSFW AS ALL HECK) - http://41.media.tumblr.com/5e13da3527c1a900c25390e5e4003130/tumblr_nv5c9rguxZ1tnjmmio2_1280.png
Sans picture by Palidozi (artist of the webcomic "chapel also ran") - http://palidoozy-art.tumblr.com/post/130187795876/it-started-with-toriel-then-ended-up-being-sans
Undertale Dual Mixes playlist - https://www.youtube.com/playlist?list=PLD90pe4VKFO8RBQdZnYYXEOgBV4F0cr6R
Extended version by Crunchii - https://www.youtube.com/watch?v=-WcQ0Vll4Lo
Introless version on Soundcloud (has a loop option) - https://soundcloud.com/iwannabethecollector/undertale-megalovania-dual-mix
You can buy the game and/or soundtrack here:
http://undertale.com/
http://store.steampowered.com/app/391540
http://tobyfox.bandcamp.com/
Also check out Toby Fox's Twitter and Tumblr for fan-artwork and overall good humour:
https://twitter.com/undertale
https://twitter.com/fwugradiation
http://undertale.tumblr.com/