Sriracha on Thai or Chinese food. Cholula for Mexican, or for a bit more kick, El Yucateco green. It's bright green, and a little goes a long way. It's made from habaneros, and it'll make your tastebuds scream for mercy and beg for more all at once! I love the Thai chiles in fish sauce they serve in most Thai restaurants, and a good Indian curry will get me every time, especially a nice hot vindaloo.