This is a very very classic scam, i encountered it many time but not (yet...) in Thailand

Rule of thumb, just smile and walk away from ANYONE (Thai or farang) who trys to befriend or hassle you if you want an incident free holiday?

Oh, had this experience once in Don Muang airport as well. 2 chinese dudes claiming to have lost their money and credit card limit exceeded. Seeing I'm a chinese as well, they claimed "chinese should help chinese." My ass. I smile and politely said "No." and walked away. Shame.

I like to say, "Huh? Huh? No understand."--whatever language they use. They lose their patience on me and leave me alone.

a good way to walk away with a smile is to tell them in spanish (my spelling is wrong) "yo to quiere mamar la panoche"..... this means i want to suck your pussy. they will have no idea what you said, but you get points across... one, you are speaking a language they have never neard and teo, you have left them with a great insult, much the same way people speak of farang while in Thialand if Thais know you don't speak or understanf Thai.

I encountered something similar but not in Thailand. Someone approaches you and said that they just went to the doctor and did not have enought $$$ to pay for the medication. Asked if you would be so kind to loan her $10 and he'll pay you back.

Another encounter I had was not my house, this woman approaches me and said she had mental problem and is undergoing psychiatric treatment and could I give her $$$ to pay for her next treatment. I declined and walked away looking back to see if she'll run amok and chased after me and hurt me with her thick-soled slipper.

I am from Singapore and I encountered these two incidents in Singapore not in Thailand.

Watch out for the older white farang that asks for 700 baht for airport tax the try to ask any farang or chinese people alone at Mc donalds at onnut BTS.

This is simple... just smile and say go see police then walk away?.
If your being bugged find a police officer point out the person.

One thing a scammer hates is attention from the police. or security..

Now if everybody did that then the scams will stop??.

As I mentioned in another topic, if they are really bugging you and wont go away

say loudly " I dont want to buy drugs, get away from me" make sure there are pleanty of " white faces" nearby that will under what you are saying. a cop near by even better.