iPhone Giveaway of the Day - Riddles - Guess the answer

Do you think you're a good thinker? Only a genius can figure out these riddles!

That's right. It's time to warm up your brain and check out some of the best riddles, guaranteed to make you think, probably get frustrated when you see the answer, and then think, "Why didn't I think of that?"
If nothing else, they're great to share with your friends so you can sound super smart.