Ghandi, when asked about western civilization, had two very good quotes. One was "If stupidity got us into this mess, why can't it get us out?" and the other "I think it's a good idea."
The best insults I've heard were from Sir Thomas Beecham. To a woman in his orchestra who was appearently a less than brilliant cellist, he is quoted as saying "Madam, you have between your legs an instrument capable of giving pleasure to thousands, and all you can do is scratch it!"