Mais oui, ma cherie!

Pears are the same - every time you check to see if they are ripe, they are as hard as concrete. As soon as your back is turned, splat! They turn into mush!

BTW - when things go wrong, we say they go 'pear shaped'. So what shape do pears go?

Occasional tables - what are they the rest of the time?

On the subject of one-liners, a typical example of the unimportance of accuracy (from the late, great Les Dawson):

My mother-in-law is so fat that she hung out her knickers to dry, and a family of gypsies moved in...

Absurdity over accuracy = humour (but not always!).