Better camera work this time. I mean not so bad."At least four people were injured and cars were swept away by an enormous wave that crashed onto the coast of Porto in Portugal.Spectators were caught off guard as they filmed dramatic waves crashing against a lighthouse at the mouth of the Douro river in Porto.As a huge wave unexpectedly came crashing over the seafront wall, bystanders and their cars were suddenly engulfed in the swell.The amateur footage shows panicked onlookers running from the sea, shouting "keep running!", as water continues to flood in over the street.Cars were dragged and damaged and according to local media four people suffered abrasions as a result of the wave."