Thai Food Customs

Every country has their own Old Wive's Tale about things you shouldn't do. Thailand is no exception. Some of these warnings might seem crazy on the surface, but most have been based on solid logic, so farangs will still hear the following axioms being said today in some Thai families. * Don't eat a double banana because if you are a woman you will give birth to twins.
* Don't eat before your elders because in your next life you will be born as a dog.
* Don't eat food without rice because you will get rickets.
* Don't eat salt under a tree because it will make the tree die.
* Don't eat other people's food without permission because it will make your throat swollen.
* Don't eat the leftovers from your child because it will make the kid naughty.
* Don't eat before a monk because you will become a bad ghost.
* Don't eat corn when you have the flu because it will give you a higher fever.
* Don't eat all of the rice during your evening meal because you should leave some for the elves.
* Don't eat cold rice with hot rice because you will lose your way easily the next time you go out.
* Don't eat egg when you have cut yourself because it will make it worse.
* Don't eat chicken feet because it will give you bad handwriting.
* Don't eat chili sauce in the mortar bowl because if you are a woman you will give birth to a child with big lips.
* Don't eat turtles because it will make you walk slowly.
* Don't eat dog because the dog's spirit will possess you.

Source: Translated from "Boran Oo-bai" by Sanom Krutmeuang

This list is thanks to http://www.enjoythaifood.com/thaisuperstitions.php

I especially like the 'don't eat chicken feet' one. I hate them.