Sense of Humor

The weddings that I have been invited to in the past namely are forgettable unless something memorable happens. Something memorable apart from vows being exchanged that is. For our wedding I want it to be a fun time and if people want to throw rice in the middle of the ceremony then I welcome the creativity and spunk. What kind of wedding invitations could be made up that reflect the same sense of humor that we are trying to go for at the actual ceremony? Are there invitations that will tell a joke or play music when they are opened up?