My coworker is a painter. He really wanted to get a contract painting a house, so he charged the cheapest he could. He bought the cheapest paint possible and just enough paint to complete the project.
With the work under way, he started to realize that the paint would have to be thinned to cover everything. He thinned it and kept painting, and kept running low. Desperation came, and he was squeezing paint from his paint rollers and brushes.
Finally, the house was done being painted.
Immediately, storm clouds gathered and rain torrented from above the house. All the work came undone. A voice boomed from the heavens, "Repaint, and thin no more".
[spoiler]props if you understand the pun[/spoiler]