Dear ProfStokes,
It's seems rather trite for a bartender to just offer congratulations to the outstanding graduate by just saying, "Cheers," "Bottoms Up!" or "Here's mud in your eye." So, I think I'll borrow the great Jimmy Cagney's congratulatory salutation to his gunslinging, gangster mom in the classic flick "White Heat," so "Top of the world to ya', ProfStokes!"
Bob the Bartender, a valedictorian of the school of hard knocks.