It is now raining cats and dogs... you now have Great Danes and bobcats crashing through your roof.

I wish I could walk through walls.

Double ouch! Suddenly you did walk through walls, as you wished for. And now you have to rebuild the house because it has collapsed about your ears, & the home insurance company is telling you to be careful about what you wish for next time.

Oh how I wish for a nice cool summer with no more bushfires.

It's a nice cool summer in Oz for once... unfortunately with an unusual amount of rain, so instead of bushfires, there are massive floods.

I wish I could teleport between places whenever I want.

You can teleport between places whenever you want, but you don't get to decide where you go.

I wish it would snow for Christmas (or even for Thanksgiving)!

~Wunder

It snows, but it's a blizzard and no one in your area knows how to handle it.

I wish I was better at reading all the books I buy.

You are better at reading the books you buy but now you keep having to get more because you have read them all.

I wish I could visit the places in the fantasy/sci-novels I read.

You do get to visit them, but only the nasty and scary ones like Mordor.

I wish I could get all my housework done instantly with a snap of my fingers.

You now get all your housework done by the snap of your fingers, but you've now snapped your fingers so much that you have repetitive strain injury in them.

I wish I could breathe underwater.

You now can breathe underwater but only in oceans.

I wish I was taller.

You're now 12 ft tall, which is dreadfully inconvenient for walking through doors or being indoors anywhere without an extremely high ceiling, or even talking face to face with anyone, let alone the inconveniences it causes with dating.

I wish I could walk on water.

You now can walk on water, but only in shallow waters.

I wish I could live on the moon.

You now live on the moon, but there's nothing to do there.

I wish I could eat whatever I liked and not put on weight.

Yes you can eat what you like without putting on weight, but it only lasts so long as you follow the doctor's instructions, & be mindful of how to look after yourself by being sensible about your dieting.

I wish that I could simply vanish at will.

Right, you can now vanish at will but you have no control over where and when you reappear.

I wish I could own a pet unicorn.

By magic you do get to own a pet unicorn . But then you would have to fill in the paperwork, stating where you got the poor unicorn from, the relevant officials, agencies & charities, all anxious to see if the unicorn was being looked after properly, plus the usual activists talking about threatened species, & wanting you to let it go.

I wish my pet cat hadn't died last year.