Will you be celebrating something during your Walt Disney World Trip? Maybe a birthday, an anniversary, engagement, marriage or a personal triumph? Make sure you have your travel agent note this on your reservation (or you can do this yourself if you prefer making the reservation on your own). Normally when you check in to your WDW resort, the Cast Member will see the notation and offer you a pin to wear to show what you are celebrating:
If it's not offered at check-in (for example, if it was listed on your reservation too close to your trip so the resort didn't receive the information), be sure to let the Cast Member who is checking you in know you are celebrating something and if the buttons aren't offered, just ask for them--they'll be happy to provide them.
Just another way Disney likes to add a little magic to your vacation!
Have you ever gotten a celebration button while at WDW? I've gotten the birthday, anniversary and "I'm Celebrating!" ones before :-)