Conversation so far:
When was Sam Harris born?
Sam Harris was born on April 9, 1967.
Where did Sam Harris go to school?
Sam Harris became interested in philosophical questions while at Stanford University
Did Sam Harris graduate?
Leaving Stanford in his second year, a quarter after his psychedelic experience, Sam Harris went to India and Nepal

Question: What had he done when he left school the first time?
Self-contained rewrite: What did Sam Harris do when he left Stanford the first time?