Thank You

Last week I was in Phnom Penh for work. The trip reminded me of the first time I was there in 2008. There were 6 of us, and we were having some drinks and snacks at a nice french-style cafe somewhere in the city. As we were about to leave, I decided to ask the waitress who was standing nearby:

"How do you say 'thank you' in Cambodia?"
"Thank you" she replied with a smile.

Confused silence, then slowly apprehension came over me.

"I mean, how do say 'thank you' in Khmer?"
"Aw khun" she replied with a bigger smile.

Siot, aku kena bahan dengan awek Cambodia!