Here's an awesome collection of illustrations from artist Mike Puncekar showing off some creepy badass version of the villains from the classic Nintendo video game Super Mario Bros. These actually look like they came out of the world of Bioshock or something. I enjoy seeing these kind of classic characters in a different darker light that in the real world would just give you nightmares.

I've provided notes from the artist, this first one is for the image above...

Bob-omb

Czar Dragon

Koopa

Piranha Plant

Spiney

Pokey

Porcu-Puffer

Shy Guy

Lakitu

Wamp King