Show the Previous Page

Is it just me or do you get annoyed when a website doesn't allow you to use the "Show the Previous Page" button?

While surfing the interweb, I was looking for seminar options for my department at work. I googled various words with booleans and was perusing various sites to see what was available. My only complaint - aside from not finding any good options for seminars - was that I would click on a site look around and then hit the back button. In a mocking manner (if inanimate objects could mock), the back button would just refresh the page and not take me back to google. I'm sure this is some kind of marketing ploy to keep online viewers on a company's website but GRRRRR!!!