Usually when I am driving back home I like to Twitter my Phone number that I am available to talk for the next 30 to 45 minutes. I have enjoyed several great conversations. I checked out http://www.someecards.com and they have a card for this very situation.
I checked out a lot of the cards and they seem like a cool company. You can email these cards for free to anyone. I sent this card to my boss.
I think you will have fun sending these cards. The company's innovation is in the content of these cards and the fact that you can buy these cards in the printed form.