Challenge.
About 25 years ago at a resort on Fiji, I sat down on the grass under a coconut tree, just to relax and enjoy the beautiful tropical air and scenery.
I am not sure how long I was there when there was a sudden THUD right next to me. Coconut. BIG coconut. It had left a curved indentation in the grass a good inch deep. It had landed less than three feet away from my HEAD.
If that sucker had hit my head... well... FReeper Ronin would have never existed.