Memorable Proposals (i.e. "Will you Marry Me?")

Do you remember how you proposed to your spouse? Did you hear about a proposal that you thought was creative, funny, touching, etc.? Why was it special? Because it was grand or expensive? Or, because it showed that the person had spent time thinking about it? Was it in front of a lot of people? Or just the two of you?

If you were to do it, how would you do it?