What's the punch line?

This is a quiz to show if your are a funny person or not.

1 Guess the punch-line: I heard that the have made pencils with erasers on both ends..
2 Guess the punch-line: Your eyes are so beautiful..
3 Guess the punch-line: Did you hear about the kid who's whole left side was cut off?!
4 Guess the punch-line: It's not that i can't juggle..
5 Guess the punch-line: I forgot how to throw a boomerang!
6 Guess the punch-line: What is something that moves every year same month?
7 Guess the punch-line: Why would Will never join the army?
8 Guess the punch-line: What do you tell someone after they sneeze?
9 Guess the punch-line: After driving his car into a tree..
10 Guess the punch-line: What is the definition of a will?
11 Guess the punch-line: Once there was a teacher who was born cross eyed..
12 Guess the punch-line: Time flies like an arrow..
13 Guess the punch-line: Math teachers have alot of problems
14 Guess the punch-line: It's not that he disliked school, its that
15 Guess the punch-line: She was the apple of his eye..