"What am I" riddles

(see below for the answers)

1) I get wet when drying, I get dirty from drying. What am I?

2) I can be cracked, made, told, and played. What am I?

3) I can fly but have no wings. I can cry but have no eyes. Wherever I go, darkness follows me. What am I?

4) The more you take of me, the more you leave behind. What am I?

Answers:
1) towel
2) a joke
3) a cloud
4) footsteps