Momentary Lapse of Reason (Chinese: 收規華; Jyutping: Sau1 Kwai1 Waa4; Cantonese Yale: Sāu Kwāi Wàh; literally "The Corrupt Wah", a reference to the main character) is a 2015 Hong Kong pre-modern action crime-thriller television drama created and produced by TVB, starring Tavia Yeung, Louis Cheung, Rosina Lam and Matt Yeung as the main cast.

The righteous Leung Sam (Tavia Yeung), a "self-combing" woman (one who vows to never marry), calls the police for help regarding a child kidnapping case.

The two successfully track down the abducted children, but Gum Wa, who was doing the job for the secret prize money, was able to steal their credit by ambushing Yat-yin.

Gum Wa had fallen for Leung Sam, but knowing that she is self-combed, he chooses to conceal his feelings, content with just staying by her side.

The mastermind behind the child kidnapping calls on Yat-yin and Gum Wa to form a secret alliance with the police force.