A number of varied experiences have led to the same summary of human nature: The Rules I Follow Should Be Enforced. Finding this in religion and parenting didn't surprise me, but my Homeowners' Association has been most enlightening. People cited for violations respond with "Yes, well, but did you see my neighbor?" Not that they would want to file a complaint against that neighbor - hence the passive "Should Be Enforced". Just a minor little rant. I would love some counterexamples proving this wrong.
No one has suggested a What If so I'm going to have to go a bit further afield. You have only yourself to blame.
What If Harry had learned Occlumency from Yoda? Yoda turned a farmkid/pilot into a trained mindwarper in just one montage - what could he do with a magician honed through years of barely escaping superior wizards? Even better would be the question of what Harry would see in Yoda's Pensieve - lust for a certain purple-lightsaber wielder? An explanation of why Yoda hung out in a swamp for 40 years? Just a few of the many incredible scenes this crossover could offer.