When your friend says she is hesitant to potty train because she doesn't want messes on her oriental rugs and she doesn't want her (nice) furniture ruined. .
And you are not overly sympathetic. . .
And you say that none of your four children have ruined any furniture (or rugs). . .
And you smile to yourself and feel just a smidge of satisfaction that those days are successfully behind you (until Baby 5). . .
For the next day you will go to your daughter's room and fall over when you see a BIG, BROWN, smeared stain on her lovely little upholstered pink chair.