A dude named Derick Childress proposed with Lights! Camera! Action! Watch the light writing proposal video below. It culminates with lights that read, "Emily, will you marry me," over part of downtown Raleigh, N.C. We find out in the comments on his Web site that Emily did in fact say, yes. Read about the process of creating the video here.
Light Writing Proposal from Derick Childress on Vimeo.