When you're chatting with your friend on MSN at the office and your boss is dangerously near your computer. Your friend should be aware of that and don't reply until he gets your OK.
DaPlaya69: I was with Monika yesterday. We start drinking and we've been into my hot-tub!
Alex @ work: Awesome! And what happens?
DaPlaya69: You wouldn't believe how horny she was!
Alex @ work: BADR!!
5 minutes later
Alex @ work: Ok, you can go on