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.
In spring, I am gay in handsome array. In summer, more clothing I wear. When colder it grows, I fling off my clothes. In winter, quite naked appear. What am I?
What jumps when it walks, but sits when it stands?
I drive men mad for love of me, easily beaten, never free. What am I?
You use a knife to slice my head and weep beside me when I am dead.
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.