Earlier quoted context omitted.
People will visit the web page because it's funny. It features a lot of pictures of Kit Kat. Geeks love junk food and might serve themselves a treat, a why not, a Kit Kat just after watching this. This process is called advertisement. Guess what? It works.
[deleted]
There's really no getting around it in this case -- either advertising Just Works as claimed, or the advertising industry has been fooling everyone who is giving them billions and billions of dollars per year into believing it works for the past 50+ years, which they would have to be doing using the principles of advertising... so it still works.