The bad advice:

All the things, wives/girlfriends take with you "for company" for shopping. Take it and go with her to the gun store! Especially if you have a license to buy something to "choose, touch, sample everything you like."Yes, not forgetting to say in the beginning: We are for a minute.

Suddenly she’ll like it, and she’ll want to buy a good gun too? And then, one not very good day, you get slightly upset and don’t have time to answer that she’s not fat.