For those who spread their wings:
Thailand: don't pick a fight, walk away. Pick a fight, quickest way to draw a dog pack, and you can't beat those. Then the police come, investigate, and while they investigate, you, as a foreigner, will sit in jail. If lucky, you will be released on bail, but you're not going anywhere without your passport. Police retain that. PLUS, your adversary will file a civil case against you, and until that goes to court, or you settle by paying him for his injuries, you will be enjoying Thailand longer than you think. And, Thai lawyers, like anywhere, not exactly cheap.

USA: 2 words: body bag, and unless you're Clark Kent, it's for you.