Hehe.
Ok, unrelated thing here that I was just thinking about a minute ago:
In a moment, I'm going to ask you and anyone else reading to think of a number.
But not just any number. The very first number that comes to mind when I say go. Do not think about it; just take the very first number that pops into your head.
Ok, go.
Now wait. The number has to be a two-digit number, and both digits have to be odd. Pick another number at random if the one you initially chose doesn't satisfy these conditions.
Got it? Good.
Now, take forty-two and subtract five.
Did you get the same thing?