What makes you say "I'll show him/her"?

I've felt that way a few times. Like having my pride hurt or having my competitive side flare up, when I'm mostly the lazy type of person. Out of the few times I said, it mostly becomes a sort of new reason to try harder where ever it may be. So that person can look down on me in one aspect but being good on other things, more things than him would give me more reason to well somehow go 'in your face!'. Just like that classmate of your who is good in Math. You might look more onto him and see what else he is good at and what he isn't and strike him there. But you see, I think trying to outsmart someone or overtake someone in his specialty whether we succeed or not helps us improve in that subject/area. Yes, if we fail, we get looked down upon again but then if that becomes our source of strength to do better in what we do, we could become someone better than that person and not just on his expertise but on his weakness as well. I'm still on that path of trying to prove myself to the person who I think is making me feel bad. Revenge conotates negativity but it can be expressed in a positive way especially for us.