Decimated
So many people use it wrongly... Decimated means to reduce to one tenth. Unless it's reduced to exactly one tenth it's original size, the object is not decimated.

Antidisestablishmentarianism
When I first moved to MD, we didn't have tv going, I hadn't been able to unpack because we had to keep everything in storage. I was a bored 10 year old. Well, when I mentioned that to my father, he gave me a word to spell. A-n-t-i-d-i-s-e-s-t-a-b-l-i-s-h-m-e-n-t-a-r-i-a-n-i-s-m - - 100 times in print, 100 times in cursive. I thought my hand was going to fall off. I may forget what it means frequently, but I will never forget how to spell it!