I buy my fast food from street vendors. I love them. The guys or gals drive around on mopeds with little sidecars built on that have a setup for cooking.
For 20 Baht (about 50 cents), I can get a freshly cooked order of Padthai noodles cooked right on the spot. The serving is huge and for those of you that eat Thai food, you know how delicious those fried noodles are.
It all gets scooped up onto a newspaper and folded up for easy carry out. Squeeze 6 fresh oranges into a plastic baggie full of ice and straw out the top, and you have a 50 cent take out meal that will feed two, and takes about 3 minutes to cook.
No bathroom available from a street vendor though.
I love those noodles....now I'm hungry again.