How do you say it? How do you play it?

Here't the thing, the other night I instructed my young son to turn out the light in his bedroom and found myself correcting what I said to "turn off" the light in his bedroom. I mean he really is only fliping a switch. It's not like he needs to blow out a lantern. And that got me thinking. How do you say it?
Do you say:
Turn out or turn off the lights?
Do you call
in or out sick?
Do you stand
in or on line?
And then the other day Adam told me he was going out to play and said he would "knock up" f...