Granted, but he turns out to be a really nasty person who only likes you because he thinks your "sexy as heck" in his words. Then you hate him for being a perv...eww
I wish my teachers didn't treat me like I was an idiot.
Granted, but then he starts treating you like a genius and enters you in spelling bee's and all sorts of competitions, and gets you a scholarship to college, and all the stress makes you drop out completely.
Granted, but then all the girls turn out to be horribly rotten, and very not nice. And your voice goes out so you can't sing anymore, losing all your fans. Sucks...
I wish I could speak French as fluently as I can currently speak English, while still being able to speak English.
Granted, but you get too tall, and everybody's afraid you're going to trample them or squish them. Also, no guys are attracted to you because of your freakishly hugeness.
I wish at least one of my really good wishes came true (this one not included).
The day, which was one of the first of spring, cheered even me by the loveliness of its sunshine and the balminess of the air. I felt emotions of gentleness and pleasure, that had long appeared dead, revive within me. Half surprised by the novelty of these sensations, I allowed myself to be borne away by them, and forgetting my solitude and deformity, dared to be happy. — Mary Shelley, Frankenstein