4. No wishing for a wish to be corrupted. This also applies to wishing for a wish to not be corrupted and wishing for nothing.
Granted, you break the rules and get banned.
I wish for a new pencil.
It's made of a uncorrupted wish. You get banned due to the wish being broken and causing a paradox.
I wish I could spell perfectly.
The developers say no.
I wish for the next wish to be not corrupted. (trying not to cause a paradox here)
EDIT: I wish I knew the psychology of human behavior very well.
Granted. POOF! Few people will experience their computer starting to crash, and that will include you.
I wish for a pretzel without any harmful substance, etc. (except yeast, salt or sugar) . All that said "except" is not too much or too less.