The line in Kung Fu: Rent a bitch, why is there no water suddenly? What's funny about this sentence? So famous?

It's not very funny, but the key lies in the scene: a boy's head almost hangs down to his crotch, washing his hair there, with no water in the middle and soap bubbles on his body ... this is black humor. Wait until another day, the landlord can also turn off the main water gate while the classmates are taking a shower. It is impossible for other students not to laugh. To put it bluntly, funny comes from life.