There is an anology that every human male should learn about very early in life. If he doesn't learn it, he will feel pain when he finally finds out what it is. Though this may seem a bit sexist but trust me, only males could really know what it is all about

First take a large grape. It could be any colour, but it should be large and not squishy. Place is on the ground, or on a firm surface. Drop a brick on to the grape. (Note: Drop the brick, don't just place it). Lift the brick and see how squashed the grape is.

Now, imagine replacing the grape with something a human male has about the same shape and size. This is know as the Grape Analogy, and if done right should bring tears to every male's eyes.