One time one of those "Congratz! You're the 999999th visitor!" banners poped up and I bought it. (I was like 11, anyway), so I called the mothefucking number and the first thing the operator says is "Oh, hon, sorry. It's only for grown ups", and hung up. It really pissed me off at that time because it was a trip to madrid in a ship or something, but now I see it was a scam. They're all a scam.
Besides, my parents got mad at me when they saw the phone bill because I made a call to the US. International calls arent cheap, you know. Even if they're 2 minute long.