YouTube features a number of videos by this talented young man named Fredrik Larsson. He uses "FreddeGredde" as his name, and is a 24 year old self-taught musician from Sweden. Larsson clearly plays (at minimum) guitar, keyboard, accordion, pipe, and drinking glasses.
The first video isn't the greatest technically, but I really enjoy the tune... even though it's apparently from a video game! It is called "Wind Waker - Unplugged."
The second is a medley of theme songs from 22 TV shows (of which I've ever seen even one full episode of... about six.
If you've time to kill, I'll give an "honorable mention" to an ambitious self-composed number titled "Beside Me," in which once again Larsson plays all the instruments, except drums.