I definitely have a least favorite item in Mario Kart, and the only way to stop it is in Mario Kart 8, but its obviously the blue shell. I know its unoriginal and all, but since i'm mostly in first place in any Mario Kart (except for Wii, for some reason I can't control my kart or bike in that game) my number one fear is that someone will go "hey look, I got a blue shell!" then use it. Actually, I have the worst luck when I'm winning in Mario Kart. Sometimes its normal: get hit by a blue shell, second place, then keep moving and try to win. Mostly I get hit with a "Power Montage" as I like to call them: Get hit by a blue shell on the 3rd lap, then get hit by 2nd place who has star power, next by third place's red shell (sometimes more than one) and after that get 4th place's blue shell (not hitting me, but flying by me and hitting me.) and then, well, you see how it is. I normally don't have that happen to me, but when it does, it looses the whole cup for me. I just hate it when that kind of thing happens, making the most obvious choice my least favorite item.