Man comes home and what does he see? Mother-in-law came over.

I don’t know how but they started a fight. About what is not important at all.

...

Mother-in-law: You just lie all the time.

Man: No way...

Mother-in-law: You don’t tell a sentence without lying!

Man: Don’t be ridiculous!

Mother-in-law: Let’s try it: tell me one true sentence.

Man: Ok but you will get out after.

Mother-in-law: If you tell me true sentence I’ll go but if you will lie again I will stay. I promise I will!

Man thought for a while and than told her one sentence. Mother-in-law suddenly realized that to keep her promise she has to hang herself.

What did the man tell her?

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