Answer:
While you were folding a letter you got me. Usually you will do whatever it takes to avoid me but now you can't help but find me.
Against the sun I protect your eyes and am often worn on the face of spies
I walk on 4 legs in the morning, 2 legs at noon, and 3 legs at night. What am I?
I mirror your actions.
I am owned by Old McDonald.
What never gets any wetter no matter how hard it rains?