You may get a chuckle out of this. Once when install a set of strap buttons at a festival the husband of the dulcimer owner made the comment that he could have saved money by doing it himself. His wife promptly replied that he could not do it himself....and off they went: "Yes, I could".... "No you couldn't"....."Yes, I could"...."NO,You could not do it!"
Finally the wife ended the exchange by saying "No, You couldn't, and the reason you could not is because I would never let you anywhere near my dulcimer with a drill!"