Everyone stops wishing, but this upsets Santa Claus who's whole existence is based on people making wishes. With a lot of new time on his hands, he orders his elfs to build a magical time machine, and he then travels back to just before that cruicial wish was made. The last thing optiow feels is the cold steel from a switchblade knife entering his heart. The world fades into darkness, but whats that sound..? "ho ho ho"...

I wish everyone would stop wishing.

Pitchfork Media suddenly realizes that everyone think they just Google all the information and in fact know nothing themselves, so they stop pretending. Instead they hire ex-CIA agents to do the job, as they have an amazing knowledge of every famous person in detail. Unfortuntately they accidently publish information that was still supposed to be secret, and to minimize the damage they track down everyone who read the reviews before they got called back, including you, and eliminate them - with bazookas.

I wish I had superpowers.

The nutcases understand they are nuts, but as with nerds that knows they are nerds, they don't do anything about it.

I wish I became a writer. 

waZelda

You are now a writer. You spend two years to write a book about 1000 uses for pocket lint, which is bought by your mum and one of your friends who later returns it. Your publisher is so disappointed by the results, they force you to buy the remaining 50.000 copies, and you go bankrupt. Eventually using the books to build a small shack under a bridge, where you live the rest of your life in poverty, with nothing to do but reading your own book over and over again.

I wish I have a functional family.

Your charter members reply, saying they never want to hear from you ever again.

I wish God would have every religious nutcase understand they are nuts, and will be accountable for what they do themselves.

You meet a mermaid while swimming far from the shore, but you found the myth is not entirely accurate. She is half fish, half woman as the tale tells, but you find its the upper part which is fish and only her legs are human. She gives you a big stinking slimy french kiss as you pass her, then swims away while you sink to the bottom of the ocean and drown in a combination of mermaid slime, your own vomit and sea water.

I wish we find a cure for all diseases without any sideeffects.

You figure out why the Raving Rabbid is in the linked banner, but you now know too much, and the Raving Rabbids come visit your home at night, dress you up like a giant carrot, snort a kilo of cocaine and eat you slowly while having a wild party all night long.

I wish I have a merry xmas.

You now have your own terminator, but batteries are not included.

I wish you have a merry xmas.

There are friendly aliens out there, but they are all plants.

You now have a 360, but it was previously owned by chinese hackers who used it as a cheap way to cause the financial crisis. The CIA just tracked it down to your apartment, sending a trigger happy SWAT team there while you play COD 4. But they mistake the sound effects for real weapons and throw in massive amounts of tear gas before shooting everyone in the whole block, with bazookas.

I wish the Gothic 3 expansion I just bought did not suck gnome d*ck.

Foolz3 avatar is now the guy in prison, but aliens abduct you and inserts a mindprobe into your brain through your rectum, making you confuse past memories with present, so you can not see it.

I wish everyone would see what kind of corporate jerks Apple has become.

(Edit: Wee, this post just gained me a Gamespot Level :D )