Last night I was watching tv, and a couple of US stand up comedians were telling 'here's your sign' jokes.
I got the jokes (duh) but I didn't understand what the 'here's your sigh' stuff was about.

A quick google later I found this
snopes.com: Here's Your Sign

Now I have a habit of answering stupid questions with stupid answers like this, but I assume you don't actually say 'here's your sign' after giving the answer in such a situation?