A different marketing channel

This is a video about advertising using a different channel.

The ad agency, Ogilvy, gives some numbers at the end of the video and says it was 7x the number in the room for the event.  I think they underestimate this.  Each person getting out of the taxi is going to mention it to at least one person: “Hey I just had the [best, odd, good, bad, interesting] taxi ride”