Here is a fun video from a group called Walk Off the Earth playing a song called “Somebody That I Used To Know. 5 people playing one guitar.
Be sure and check out some of their other songs on YouTube as well.
Heck, while we are on the subject of multiple people playing one guitar…here are a few more for some fun.
2 people on one guitar
3 people on one guitar
…how about 2 times 2 people on one guitar
Now go find a partner and start practicing on the same guitar.