Goal and options: To make wavy lines in Photoshop
output answer: Start with the zig zag tool then use the arrow tool to make the lines curvy.

Goal and options: logs
output answer: can become a mulch when shredded

Goal and options: How can you get a child to smile in a photo?
output answer:
Ask the kid to tell you to tell you a joke, and then tell them they CAN NOT laugh (it will crack them up and they can't help but smile).