diànyǐngyuàn zhōngtú qù xǐshǒujiān huílái shí kàn qīng yǐngtīng hào hé zuòwèi

电影院中途去洗手间，回来时看清影厅号和座位。

If you go to the restroom during a movie, check the screen number and seat when you come back.