turn (someone) into a pumpkin

Translations
превратить (кого-то) в тыкву
If I'm not back by midnight, I'll turn into a pumpkin.
Если я не вернусь к полуночи, я превращусь в тыкву.
Definitions
A humorous or whimsical expression meaning that someone must leave or stop what they are doing at a certain time, often referencing the fairy tale of Cinderella, where her magical coach turns back into a pumpkin at midnight. It is not meant literally, but rather as a playful way to indicate a deadline or curfew.