1. Splashing out £3 for a meal is extravagant.
2. A weekend on a tropical island is only a few hours away.
3. £4.50 per night is a reasonable price for a double room with en-suite bathroom (basic as it may be).
4. Everyone you know owns at least one yellow shirt.
5. In the morning, you don't need to stick your head outside to decide what to wear. You don't even need look out the window to decide what to wear. In fact, you don't need to wake up to decide what to wear. 
6. You're beginning to understand the notion of “Thai time”, meaning don't expect anything to be done by the time you expect it. 
7. You had fried rice for breakfast, lunch and dinner, and there's nothing odd about that. 
8. You debate whether £8 is too much to pay for a pair of shoes.
9. Playing “spot the ladyboy” is a fun way to pass time. In school. 
10. When you see other farangs in your neighbourhood you assume they're either teachers or lost (applies particularly when your neighbourhood is Soppong or Khun Yuam).
11. You feel superior to backpackers. 
12. You catch yourself saying “My birthday five December, same-same like King”. And in fact generally speaking in a Thai accent.
13. Seeing a family of four and their dog all piled on a motorbike doesn't surprise you.
14. You do your shopping in the market, not Marks & Spencer.
15. You have seriously adjusted your notion of what constitutes "really good English"
16. You understand why 555 is the new LOL.
17. You know how to respond when someone asks "poot tai dai mai?", "bai nai?" or "hew mai?"
18. There's condensation on the *outside* of your office window, and in the winter it's a relief to get *out* to the warmth!
19. The word "soi dog" does not make you think of a vegetarian BBQ.
20. The only question during a medical check up is "How are you today ?"
21. You thank the Thai bloke in the bar for telling you "how handsome you are" rather than kicking him in the teeth like you would have done if the same thing happened back home.
22. You pardon everyone for acting as if they are from another planet especially if they're from Bangkok.

Have you got anything to add to this?  Tell us what you found weird in Thailand below!