- Mary-Ann got home late from school. Asked where she had been, she said she had spent the afternoon at the library. Her father thinks she is lying and says: "I know you haven’t been there because I was there myself". He is lying because he thinks she will tell the truth if she realizes she has been caught.
- boyfriend – “your sister told me everything” (sister did nothing) –
girlfriend – “Oh, did she? I’m gonna kill her.
The rationale for doing this is to catch someone by surprise so he will admit having lied. Soemtimes, however, the person isn’t lying and the real liar will have to reap the consequences of his reproachable action, having to admit he was just/it was just ………..(saying or idiom)…..