Be careful what you wish for...

[The Elf-warrior]

I wish the Balrog had decided to have a lie in on the day that Gandalf and the others escaped from Moria.

Your wish is granted. Unfortunately this was because he had mutated avian flu. He got it from the Orcs and the Orcs spread it to Merry and Pippin and on and on and on until it became a global pandemic.

I wish that Turgon had listened to Tuor and evacuated Gondolin