Even as a kid I was someone obsessed with knives. My mom didn't like me to have knives (which made me want them even more). I used to order them in the mail from the back of my "Boys Life" magazine when I was somewhere between 8 - 10 years old. I would save my money, walk to the local convenient store and get a money order. Then I would mail it in for the knife and try to get to the mailbox before my mom for the next 3 weeks to get my knife without her finding out. Those knives sucked, but as an 8 - 10 year old, I thought they were the best thing ever.
As an adult, the worst knives have problem been a few of the Smith and Wesson folders I've had. They are seriously worse than the Chinese M-Tech knives which you can buy at truck stops (most of the time, I actually like the design and feel of those for the price).