One should make only a good wish. Thinking about bad things and saying them aloud is not appreciated. People believe that if they make a bad wish, angels will hear it and it will happen. Therefore, it is not good to make bad wishes even as a joke. If somebody makes such a joke, people say certain phrases to make sure to prevent it or warn a speaker about it.
Gapingizni shamol uchirsin!
Yaxshi niyat qiling.
Yomon niyat qilmang, farishtalar hammasiga omin deydi.
Yaxshi niyat-yarim mol.
Let the wind blow your wish away!
Make a good wish.
Don’t make a bad wish, angels will say amin and it will happen.
“A good intention is half of the article,” e.g. if you make a good wish, you will reach your goal.