Contra

If you were a fan of Seinfeld, you might remember the episode where George decides that the key to successful living is, "to do the opposite of what I would normally do".

Contarian
Contradict

There are many Bible verses that seriously espouse this practice, like blessing those who curse you.

Graham Cooke talks about doing the opposite of what you feel a knee jerk reaction to do.
Lily talks about experiencing this in much the same way as I have.