I've also cheated on several math tests over the years by inputting all of the formulas and samples needed into my calculator beforehand.
I've cheated plenty of times for other people in English and History, but never for myself. I would never plagiarize a paper or anything like that, though (would never be able to bring myself to do such a thing). I'm sure everyone has their own preferences, but I was virtually always out to prove something in those classes (that it's possible to be top in the class without ever opening the textbook/taking a single note/doing any nightly homework/etc).
For math, though... I'd probably still be in Algebra I if not for the calculator trick.

I'd say the majority of you already know this, but for those that don't:
[spoiler]My mind just isn't palatable with mathematics or numbers or anything like that. I'm wired much more toward personal analysis and working out my own, unique solutions. I think it's mostly that there's no opportunity for true self expression in a math classroom: the answer is essentially either right or wrong, and there's rarely an argument to be made either way (of course, in earlier years, it had to be exactly as the teacher wanted when we had to show our work, and that certainly did much for putting me off the whole thing).
One way to put it would be that I want to be able to do my own thing instead of doing what everyone else is doing. Following someone else's example and being expected to do something exactly as everyone else is doing bores me to TEEEAAAARRRRSSSSSSSSSSSSSSSS and holds no appeal for me, personally. I know there are plenty of people that adore math and can't live without it and I'm sure have a multitude of reasons as to why they enjoy it, but it's really just not for me.
All that said, I can do well on a math test if I absolutely must. I did well on the math portion of the SAT and all of the state-mandated math tests throughout my educational career (mostly because they were always multiple choice, which renders it almost too easy).[/spoiler]