I had a dream last night that someone posted looking for ideas for a grand exit. These were some of the suggestions:
1. Hire a helicopter. (Great for rooftop weddings!)
2. During the last dance, have a masked gunman burst in and pretend to kidnap the bride.
3. Jump out the window. (Especially dramatic if your reception is held in a high rise building.)
4. Let the groom go ahead and leave to go to a bar with his friends and you just stay and have fun. No one will notice he's gone anyway.
Just in case anyone is looking for ideas.