Your wish is granted! You're now a very hard worker. In fact, you actually work too hard. You can no longer do anything that isn't productive, and fun is never to be had again.

I wish I could unsee things that were unpleasant to see.

Wish granted! But unfortunately, I'm going to have to perform a rather unpleasant surgery on you to give you this ability... thus you would unsee it and forget you could unsee things!

I wish for a cardboard box!

Granted, but now you're sealed inside the cardboard box, and you're being shipped off to a third world country. Good luck getting home.

I wish someone made a better forum logo for the Rainforest skin.

Wish granted, However I MADE IT! MWAHAHAHAHAHAHAHAHAAAAAAAA!

I wish that this course was cleared, and i got a card.

Wish granted, but you get a panel instead. And none of the other ones you get will match.

I wish I had taken better care of my teeth.

wish granted,
You now have perfect teeth, however, you now also have fangs, and a thirst for human blood, you must feed in order to stay alive.

I wish i had an electric guitar that could blow stuff up.

Granted, but when you use it, you blew yourself up.

I wish I can fight my rival in a public place.

Wish granted, however, the area you are fighting in is right in front of a police station, you are quickly charged with, Assault, street fighting, disturbing the peace, and attempted murder while your rival gets off Scott free.

I wish i were an argonian

Wish granted, but humans persecute you, especially in that one town in Skyrim (Windhelm).

I wish i have a Rock Lobster.