I wish I didn't have to keep on harping on the same thing, but there is not a single good person in the entire bible! Seriously, we're expected to look up to these people, but they're criminals! This sibling rivalry goes beyond mere punches in the arm. Genesis 25-34 explains that Esau came in from the fields feeling faint. Jacob was cooking some stew, and Esau asked for some of it because he was starving. Jacob, being the greedy manipulative leech that he is, convinces Esau to give up his birthright in exchange for the meal.
To put things in perspective, we must remember that Isaac is offensively wealthy. He owns an extremely large area of land (stolen from the natives), a multitude of laborers (i.e., slaves), and probably a lot of stock in Walmart. Whoever receives this mother-of-all-birthrights will be set for life. In today's market, it would probably fetch upwards of several billion dollars, and Jacob is expecting Esau to just piss it all away for a bowl of pottage.
Of course, Esau could have just walked a few seconds more to his own tent and had dinner for free. That's why this story is completely unbelievable; nobody would do that. Furthermore, the story is completely useless. When your choices are, give up billions of dollars or wait five minutes for a meal, you don't need a parable to explain the possible faults. The right decision is already obvious to anyone who didn't eat a lot of paint chips as a child. Guess what, we also don't need a parable explaining why it's a bad idea to smash your kneecaps with a ball-peen hammer.
One final note: Genesis 25:30 mentions that Esau is also called Edom (which means “red”), because the stew he ate was red. Again, this belies the earlier statement of Esau having red hair. If he had a nickname which meant “red”, don't you think he would have gotten said nickname because he was a redhead? That would be like someone with blonde hair who is never called “blondie” until, one day, they eat the dessert with the same name, and suddenly they receive the nickname. Stupid, stupid, stupid.