The answer is "laughing".
Explanation and analysis: This question is a brain teaser question. The question "What is it not illegal to steal?" has two meanings. One is that the conventional "steal" belongs to the verb "steal". , then no matter what you steal, it is illegal;
The other is the noun "steal", the second is more in line with the unconventional problem-solving ideas in brain teasers, and "steal" Although "laughing" contains the word "stealing", it actually describes a person's silent laughter, which is mostly a smile with evil intentions. Therefore, "laughing" is not illegal.
Extended information:
Brain teaser problem-solving ideas:
When making a sharp turn and there are obstacles in front of you that prevent the car from traveling in a straight line, you have to go somewhere else. Open routes and sharp turns are usually when there are special circumstances and you need to quickly leave your usual route and take another route, such as "When does four minus one equal five?"
The answer is: when one corner is subtracted from the square.
Explanation and analysis: Subtracting an angle of different sizes from a quadrilateral will turn it into a triangle and a pentagon, so the answer is: when one angle is subtracted from a quadrilateral, it will equal five.