who was involved in the accident in chapter 3. Why is it signifigant?

At about two in the morning, Nick decides to walk home; on the way, he sees Owl Eyes, who has crashed his car into a ditch. Owl Eyes loudly proclaims that he is finished with the whole business; it is not clear (either to Nick or to the reader) what, if anything, he means by this. In any case this accident is a metaphor for the reckless behaviour of the people who inhabit Gatsby's parties.