What should I do if I meet a liar in the street? For example, a child selling roses pulls your clothes, passers-by come and say they want to give you something for free to pester you, and beggars pretend to be deaf and dumb. Last time I met a door-to-door alarm. Pretend to be a department. This is not a warning brought or notified by the property. Let's say it's free, and what maintenance fee will be charged after installation. Tell him to pack up and leave here. Salesmen and liars. Even such people are not allowed to enter the door. Don't believe anything for free anyway. The more you say free, the more you should be vigilant. In short, don't be curious when you meet in the street, let alone be greedy for petty gain.