I fell in love with this dish a few years ago when I was in Chiang Mai. I've had it several times since in Bangkok and again in Chiang Mai. Sadly, I haven't been able to find it here in the U.S.
Kaow Soi Gai – Famous Chiang Mai Curry Noodles with Chicken
http://www.fourseasons.com/chiangmai/menu_1418.html
The dish is served in a bowl, with curry noodles with chicken on the bottom. It is crowned with crispy noodles with some condiments, both sweet and sour. In your mouth, it is a juxstoposition of soft and cruncy, sweet/sour and spicy.