A non Minecrafters sees a creeper just how it looks.

However, we Minecrafters see how a creeper is on the inside. A freaking hulk with a creeper head on top.

Seriously, I think creepers are the most op mob. Sorry enderman, but it's true. They survive water, daylight, and can destroy a lot of work in a single blow. They can even kill you if you don't have enough protection.