Siblings: children of the same parents, each of whom is perfectly normal until they get together.
It's so simple to be wise. Just think of something stupid to say and say the opposite.
It's not the sugar that makes the tea sweet, but the stirring.
Insanity is hereditary; you get it from your children.
You must pay for your sins. If you have already paid, please ignore this notice.
It was on my fifth birthday that Papa put his hand on my shoulder and said, 'Remember, my son, if you ever need a helping hand, you'll find one at the end of your arm.'