Men are like drink machines...

You put your dollar in, and it spits it back out. You put it back in, it spits it back out. You smooth it down even though it's smooth to begin with, and it STILL spits it back out. You try one more time and for no apparent reason, it takes your dollar.

You say something, and they don't get it. You say it again, and they still don't get it. You reword your statement to make it even easier to follow, and they STILL don't get it. Finally, after you've almost given up, you say it just like you did the first time, and they get it.