It is very easy to open the door, announce yourself, and then start complaining about the color of the drapes, the bad taste in carpet ... etc.

Yeah but what takes real chutzpah is coming in uninvited, defecating in the punch bowl, and then incoherently complaining to all passers by about the taste and how this jar of your urine is much better.

Surprisingly most copies of How to Win Friends and Influence People are missing those pages . . .