I've heard that one I can't remember if it was light or a hole, cause they both make sense.Hmmm... can't figure out your riddle currently, I DO have one that I know...
Perhaps my favorite:
"What is weightless,can be seen with the naked eye,and when you put it in a barrel,it makes the barrel lighter?"
You can't dig half a hole - as soon as you dig, it's a hole. It just gets bigger the more you dig.If it takes 4 men an hour to dig a hole, how many men would it take to dig half of a hole in an hour?
...............You,......have chosen wisely!hmmm i am going with nothing for my answer here, cause i know nothing greater than GOD!