Well here is a theread dedicated to some of the most stupid inventions/ideas of all time:

1) Head and Shoulders Mint shampoo. Imadgine getting normal shampoo in your eye. It hurts dosnt it? Now imadgine billions of wasps stinging you in the eye, that is what mint shmpoo feels like....!!!!

2)Coca Cola toothpaste.... I mean whats the point, it dosnt taste like coke and it feels like brusing your teeth with rubber....

3) Toilet paper with imprinted shapes. Why, why, why. why, WHY have toilet paper with stupid shapes that costs 10 times more then normal toilet paper when all your going to do is whipe sh** onto it!

Well thats all I could think of atm....