When I'm in Thailand I always order my food 'phet maak maak' so they spice it properly and don't give me some sort of bland white man's version. Many years of training have made me impervious to chilli at either end. Recently, however, in a food court in a Bangkok department store, I ate a som tam that was literally like eating flames. My whole face was numb for hours. God alone knows what they put in it, but they weren't ordinary bird's eye chillis.
Luckily, my sphincter seems to be amde of asbestos, for I was troubled not at all later on.