Andrew has seen a flash of his future. (Dad: unfinished PhD. Mom: unfulfilling career. Their marriage: unsuccessful.) Based on what he's seen, he's uninspired to put a foot on the well-worn path to the adulthood everyone expects of him. There must be another way around.
After a particularly disastrous Thanksgiving (his cousin wets Andrew's bed; his parents were too chicken to tell him his grandmother died), Andrew accidentally (on purpose)...