Already an old and लोकप्रिय question. Now, assuming that having three instantaneous wishes at my disposal will not affect the natural balances of time, matter, causality and general confusing physicsy kinda shiet like that, I still would not want them. That kinda power is just not meant to be in human hands. Look at all the other powerful people that have ruined this earth from corruption due to..whats the word...power overload? Also, people say "No evil" as their first wish....... ....can आप imagine!??! Everyone unconditionally loving one another without a single evil या inconsiderate thought. That can't happen. There must be a balance of good and evil.
And same goes for all major wishes like that. आप go and wish that all the pollution wasn't destroying the earth. That would confuse the shit out of people, and defy the laws of science.
If आप don't wanna read all of that, the simple answer is: Some things are just not meant to be changed, and man shouldn't have that sort of power at his fingertips.