Numismatic collectables as you know can run the gambit of items from neck ties to glassware, but you want a puzzled look from your spouse just say you bought a cigarette case on eBay.  So you are going to take up smoking now?  Well no was my response, but it is really cool as it has a fictious series 471 note engraved on the outside of the case.  At that point I wondered, out loud, if it would work as a business card holder as it is eye catching which ended with the comment you're cute.  That is okay as I guess you need to be a little nuts to get excited about your latest MPC acquisition then again she may need to get her eyes checked saying I am cute.