Americans say "Goodbye", the British say "Hello", Hawaiians say "Aloha", Mr. Spock says "Live long and prosper". Do you have a particular way of saying goodbye or ending a conversation?
I got to thinking of this topic a few days ago because we recently got a new girl in our office. At the end of the day, I'll say "See you tomorrow" or "Have a good evening". This girl likes to say "Be careful" and that struck me as a rather pessimistic ending to a conversation, like she expects some catastrophe to strike me on my way home. The world must seem like a very dangerous place to her.
I wish I had a more unique valediction but I've never taken the time to come up with one.
Another funny note...I remember reading an article about office etiquette and it said you should never end a business call with "bye-bye" because it's kiddy and unprofessional. I had never thought about it before but noticed to my horror shortly after reading this article that I did sometimes end calls at the office with "bye-bye". I loosened up, though, when I noticed lots of people calling me ended the call with "bye-bye" so maybe it's ok in the South. That's the way we roll.