"After he had sent them across the stream, he sent over all his possessions. So Jacob was left alone, and a man wrestled with him till daybreak. When the man saw that he could not overpower him, he touched the socket of Jacob's hip so that his hip was wrenched as he wrestled with the man. Then the man said, 'Let me go, for it is daybreak.'
But Jacob replied, 'I will not let you go unless you bless me.'
The man asked him, 'What is your name?'
'Jacob,' he answered.
Then the man said, 'Your name will no longer be Jacob, but Israel, because you have struggled with God and with men and have overcome.'
Jacob said, 'Please tell me your name.'
But he replied, 'Why do you ask my name?' Then he blessed him there.
So Jacob called the place Peniel, saying, 'It is because I saw God face to face, and yet my life was spared.'
The sun rose above him as he passed Peniel, and he was limping because of his hip. Therefore to this day the Israelites do not eat the tendon attached to the socket of the hip, because the socket of Jacob's hip was touched near the tendon." — Genesis 32:23-34
Jacob (a human, by the way) wrestles with God (you know, the ALL-POWERFUL Creator of the Universe), and God (who is Omnipotent AND Omniscient) has to pretty much beg Jacob to let him go. So Jacob makes a demand. Of GOD. And gets what he asks for.
I have to wonder...how would God do against, say, Randy Couture? I mean, sure, God's had 3,000 years or so to practice, but just think of the reward. Jacob's family became the most favoritest of ALL the people on Earth...EVER!! OK, so he essentially won a chunk of otherwise worthless land that has been the center of endless dissonance for eons, and those same people—although "God's chosen"—are going to burn in eternal hellfire when God's son comes back. But still, the prize has got to be pretty damn fabulous.