Adventure Time is an American show on Cartoon Network created by Pendleton Ward. It's a series that follows adventures with Finn (voiced by Jeremy Shada) a human boy and his best friend Jake (voiced by John DiMaggio) a dog that can change shape size grow and shrink at will. Along the way they interact with other main characters such as Princess Bubblegum, Ice King, Marceline the Vampire Queen.
Here's a video I tried to find the best one that was under 2 minutes. https://www.youtube.com/watch?v=OhFpuitb75I :)