If you don’t watch Adventure Time on Cartoon Network or basically pirated everywhere on the internet, you should watch it.
If you do watch Adventure Time, you should also see this:
This YouTube video deserves way more than 3,000 views.
Fun Fact/FYI: That running gag on the show is called PHIL FACE, named after the lead character designer for Adventure Time, Phil Rynda. Here is the Adventure Time wiki article for PHIL FACE: http://adventuretime.wikia.com/wiki/PHIL_FACE