Rewarded Jokes

There is a blonde a brunette and a redhead and a magic mirror. If you told something true to the magic mirror, you would be rewarded. If you told a lie you would vanish forever.
The brunette walks up to the mirror and says, "I am good at teaching." And she was rewarded.
The redhead walks up to the mirror and says,"I am good at math." And she was rewarded.
The blonde walked up to the mirror and said,"Hmmmmm let me think...."
Poof! She vanished!