Difficult

What do you have when you're sitting down that you don't have when you're standing up?

They belong to me; they belong to you; They can make you feel happy or make you feel blue; They never end until the day you do.

There are several different kinds, but the one you pick doesn't do its job. What is it?

As I walked along the path I saw something with four fingers and one thumb, but it was not flesh, fish, bone or fowl.

Riddles and Answers