Two blonde builders were working on a house. One blonde was on a ladder nailing. She'd reach into her nail pouch, pull out a nail, look at it, and either toss it over her shoulder or proceed to nail it into the wood.

The other blonde couldn't stand it any longer and yelled up, "Why are you throwing some of the nails away?"

The first blonde explained, "When I pull it out of my nail pouch, if it's pointed toward me I throw it away. If it's pointed toward the house, then I can use it!"

The second blonde explained, "Don't throw away those nails that are pointed toward you! They're for the other side of the house!"
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Cartoon below is from "The Book of Bunny Suicides" by Andy Riley...