In college, a long time ago – I had just graduated and it was a summer job before grad school.
Clientele was young and unsophisticated (small joint near the university) and I didn’t need to know much. “Screwdriver” or “Bloody mary” was about as complicated as it got.
Customers were my age or a little older – nothing memorable. Tips were OK, but not generous. This was not a high-end place.