The first one would be a lie, which would mean Captain Obvious would be saying something untrue and therefore not obvious. Wouldn't that create some sort of paradox or something...?
"You are reading English", "This is a meme", "Moon is a planet", "Water is wet", "Right side is at right and left side is at left", "You are using a computer"... Seriously, what do you feel when seeing this in front page ?
I admit some of them are stupid, but some can be funny too, same as any other meme...
Oh well, different people have different senses of humor, I suppose :)
If some of them may be funny, I've never seen them. And about the "Different senses of humour" part, I'll answer you what I always say IRL: "Lions eat meat and zebras eat grass, go convince the lion that grass is delicious".