I can provide some insights into potential behaviors that might indicate a problem in the situation you described.
If someone reacts extremely negatively or irrationally to a simple request for $10, such as threatening to call the police, it could be a sign of a few things:
Narcissistic rage: Narcissists can react disproportionately to perceived slights or challenges to their authority or control. They may become intensely angry and lash out aggressively in response to any perceived criticism or rejection.
Emotional instability: Extreme reactions that are out of proportion to the situation might indicate underlying emotional instability or difficulty regulating their emotions.
Paranoia or delusions: In some cases, individuals with certain mental health conditions may have paranoid thoughts or delusions that lead them to believe others are trying to harm or take advantage of them.
Previous negative experiences: It is possible that the person has had negative experiences in the past that make them wary of others' intentions, leading them to overreact to seemingly innocent requests.
Manipulative tactic: Some narcissists use threats and intimidation as a way to manipulate and control others. By responding with an extreme threat like calling the police, they may be attempting to scare you or make you feel guilty.
It's important to approach such situations with caution and prioritize your safety and well-being. If you are concerned about the person's behavior or mental state, it might be best to distance yourself and seek support from friends, family, or a professional counselor. Engaging in a conversation with someone who exhibits erratic or potentially dangerous behavior can be risky, so it's essential to prioritize your safety and emotional health.