Amen and Amen to that one brother. Firstly, I figure if they wanted help, they would ask for it. Secondly, they may resent your idea of "help".

Don't borrow any tools, don't give them your phone number, don't try to sell them anything (especially a CAR!!!!) and stay out of the way and let the police respond to burglar alarms.

Another one I've learned recently is if you are male, keep any interaction with their wives to a minimum. About as far as you should go, is "Hello" and "How are you?" while your walking into the door of your own abode and end it at that. Some guys do not like any man talking to their wife for any length of time and get really really jealous.