One particular cosmetic product you HATE but others seem to love?

Not really a cosmetic, but I don't like false eyelashes......when I wear them it feels like I'm carrying the weight of the world on my lashline. I prefer the look of natural, curled and mascara'd lashes instead. There aren't any other cosmetics I don't like----in my eyes, all cosmetics are created equal. There are many people that I've encountered who don't know how to correctly apply the item, but its no fault of the makeup.