My favorite phrases is, "If you don't have nothing good to say to somone don't say it at all". And another one is, "Do unto others as you would have them do unto you." If we follow these phrases the world can be a better place!
My favorite is actually one that drives my hubby batty. When he asks why I'm doing something the way that I'm doing it (stupid question to begin with), I tell him that I'm doing it 'for sh1ts and giggles'.