
We'd like to point out that the light graffitti trend [1] has already been used in commercials, here's an example from May March this year, months before that Sprint Waitless campaign [2].
Agency: Luckie & Company [3]
Links:
[1] http://commercial-archive.com/node/141772
[2] http://commercial-archive.com/node/139317
[3] http://www.luckie.com
[4] http://commercial-archive.com/user/register
[5] http://commercial-archive.com/product
[6] http://commercial-archive.com/faq
[7] http://technorati.com/tag/home - domestic living (ads)