Granted. Your life is restarted, but everything happens exactly like it did and you have no control over it. You are forced to re-live you live again, remembering what would happen but unable to change it.
The Monkey's Paw
Want to make a wish? Just ask the Monkey's Paw! No strings attached*.
(*) Satisfaction not guaranteed. Wish may backfire unexpectedly.
Just create a post that starts with "I wish ___" and wait for other users to write how your wish didn't turn out how you expected.
If you're feeling inspired, you may even use the wish as a sort of writing prompt.
Example:
Title: I wish for more wishes.
Answer: Granted. A piece of paper the size of a business card appears in your hand with 4 dotted lines for you to fill out your wishes and a little checkbox in front of each. Now to find someone who will grant those...
Granted. You are born again with your current mind which continues to age. You are the world's youngest dementia patient.
Granted. You are born with locked in syndrome and unable to communicate with anybody, trapped in your own mind for your entire life.
Granted! I have injected poison into your body. Watch as your life flashes before your eyes…