THAILAND HAS such a long history of coup d'etats that this week's military revolt reminded me of an old joke. A tour guide brought a female tourist to a kick-boxing arena in Bangkok. “This is Muay Thai, our national pastime, ” he began. “It involves kicking, punching, elbowing, kneeing, and head-butting the enemy to wear him down and knock him out.” The lady gasped, “It is revolting!” The tour guide responded, “That is our second national pastime.”