21. It is illegal in Thailand for men (and women of course) to go bare-chested in public. You must wear a top at all times!

22. It is illegal in Thailand, to leave your house if you are not wearing underwear.

23. After spending the night together (unmarried couple) the female is entitled to ask the man to marry her - and give a dowry. If the man doesn't want to get married, the women is entitled to seek compensation ie....money.

24. The man is entitled to sue his new wife in a court of law and get his dowry back, if it is found that the bride had had sex with another man before, and so - not a ‘virgin’ at the time of marriage. (Stephen)

25. Since 1939, it has been illegal to NOT stand-up for the national anthem.

26. The tablet form of the drug 'Methamphetamine' is known as Ya-Ba (Crazy Medicine).More popular though, is its original name 'Ya-Ma' which translates as 'Horse Medicine' Contrary to popular belief that the slang came from 'having the power of a horse', the name did in fact come from the logo which was printed on the pill when it was once legally sold over the counter in Thailand (banned in 1972). Methamphatamine, sold in its original form and distributed by the pharmaceutical company 'Wellcome' had its logo of a horse's head stamped on each tablet.

27. "Red Bull", the popular energy drink found in many places throughout the world, is based on the Thai soft drink "Krating Daeng" much favoured by Thai Tuk-Tuk drivers.

28. King Mongkut (King Rama IV) was the first Asian monarch to be fluent in English, both spoken and written.

29. The first ever shower in Thailand (as most may think of a shower anyway) can be found at Vimanmek Mansion in Bangkok.

30. Built on a marsh known as Cobra Swamp, 15.5 miles east of Bangkok, Suvarnabhumi (pronounced "Su-Wana-Poom") boasts the world's biggest passenger terminal under a single roof and the tallest control tower.

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Read more 100 Things You Didn't Know about Thailand at ThailandQA Forums.