R.S.V.P.
R.S.V.P. comes from the French phrase, 'r�pondez, s'il vous pla�t,' which means 'please reply.' According to western etiquette, you should reply promptly if you receive a formal invitation.
Switching letters
Switching letters is called spoonerism. For example, saying jag of Flapan, instead of flag of Japan.
More Language Facts
999
One thousand contains the letter A, but none of the words from one to nine hundred ninety-nine has an A.
Alternates hands when typing
Skepticisms is the longest word that alternates hands when typing.