What do I do when the police want me to come in for questioning about something I did?

The simple answer I give people is to keep your mouth shut. Generally, if you did something and the police want to ask you questions about it, you should not say anything and talk to your lawyer. You will not be able to explain away what you did. The police are trained and experienced in this game, you are not. Think of Joe Pesci from Goodfellas who gave the police nothing. Another piece of conventional wisdom is that if the police want to talk to you about something, and you have not been arrested yet, the police do not have enough evidence yet to charge you and are looking for that evidence to come from your own mouth. In other words, if you're not already in jail, they don't have a case against you yet. Remember, anything you do say to the police will be used against you, so why help the police convict you?