Mayer McCann Erickson, an ad agency in Slovakia, had a contract to promote a brand of vacuum cleaners. But the agency didn't have enough money to do a lot.
So it recorded cars driving into a well-known highway tunnel in Slovakia. Then it digitally edited the video to show cars getting sucked into the nozzle of the vacuum cleaner. The agency began circulating the video on the internet. Success!
-via Ka-Ching!