Here's a subtle one that I picked up on AdPulp.

No flash. Almost zero branding branding. Just a low production cost video that's destined to be shared around for a few laughs.

Commissioned by Parrot (a bluetooth company) to coincide with a new law in California that bans the use of cell-phones behind the wheel the advert is obviously designed to sell some of Parrot's hands-free kits.

It's definitely good in the viral sense, I just wonder if they overdid it a bit with the subtlety. Viewers sometimes even appreciate an advertiser's efforts to entertain them - especially if that party's product ties in nicely with the message. However, a simple URL might just be ignored and jettisoned from the memory banks. I'm surprised that they didn't even include a line syaing "Suppliers of hands-free kits."

A fine line to tread...