‘If It's Not One Thing, It's Your Mother’ — Robin Williams

In one of his famous improv's, waving an imaginary psychoanalyst's cigar in the air, Williams said it on one of Charlie Rose's interviews (2002 or remembrance this week; you'll have to find it yourself) and it went by so fast I almost missed it. But it was simply too good not to record for posterity.

UPDATE: Stella says Marlo Thomas quotes Williams as saying this in a short biography in one of her books. Don't know which book; Stella returned it to the library. Growing Up Laughing.