Good Riddles

Question: What goes up but never go down?

Question: What do you get when you cross an elephant and a fish?

Question: Why was the woman fired from the car assembly line?

Question: While you were folding a letter I got you.
Usually you will do whatever it takes to avoid me,
but now you can't help but find me.

What am I?

Question: Soft and cuddly, I'll pull on your heart.
But take my last name and I'll tear you apart.

What am I?