Do not accidentally order a dish, with nearly-correct Thai pronunciation, that is a variation not on the menu.
If you do, and realize it when the waitress looks at you in surprise and says "Oh! Yes! We can make that, too!", the first thing to do is hastily apologize, and say no, you'll be pleased to eat whatever the cook wants to make, your apologies.
Realize, the cook is going to bring the dish out, and the main entree, and that when the main entree comes out, the "mild" you asked for is going to be Native-Thai-mild, not American-mild. Smile, eat the dish, try to pick out the shaved slices of thai bird chilis, and declare it perfect. Because it's your fault for absentmindedly letting the very nice waitress assume you know enough about the culture and food to be able to handle the culture and food.
So, remember, self!
Tom Yung Koong is tom yum soup with shrimp. That is what Siam Cafe offers. Tom Yum Gai is with Chicken. Do not order tom yum gai if it's not on the menu, or be prepared to sniffle and sweat through your "mild" Koong Pad Ped! (red curry with shrimp and veggies)