You find an old lamp and after rubbing it, a Djinn (Or Genie if you prefer it) appears As a Djinn, he's extremely powerful compared to puny humans, but he's not all powerful, for example he isn't immortal (Djinns are only really long lived, being able to live for hundreds of years) and if you destroy the lamp, he will die. Also, Djinns cannot free all of their brethren with a wish, everyone has to be released through the wishes, so they can use their magic and return to their original world.
In exchange of his freedom, he will have to grant three wishes to the one who awakened him. However, there's several rules he cannot break:
No resurrecting the dead.
No making someone fall in love with someone.
No extra wishes or changing the rules.
No messing with time or history.
No becoming a god or transcendent being.
No becoming or making somebody immortal (You can go for eternal youth or enhanced regeneration instead, but not both).
No transforming places into something (Like turning the Moon into cheese).
No materializing fictional characters, objects and extremely powerful abilities.
Also and to properly formulate the wish, you need to say ''Genie, I wish...'', so he cannot mess with your wishes like in some stories. Still, try to be precise with your wording, as if you treat the Djinn badly, he will twist your wish if you are not specific enough.
What would be your wish be? How would it affect the world? Would you befriend the Genie after being he's free?