EDIT: This is now dead.
Costco is offering free Crest Pro-Health Rinse to people who can type twelve numbers in a row. The link can be found below for your copy and pasting pleasure.
Crest goes out of their way to alert us that this freebie is good for our health and in rinse form, but they never say where to rinse. I tried pouring this on my head once and all it did was make me look like a Smurf.