Writing Tip 369: God Rest Ye Merry, Gentlemen (yes, the comma goes there)
We're not talking about any "merry gentlemen" here. Did you ever notice the correct comma placement within the opening line of the classic Christmas carol, "God Rest Ye Merry, Gentlemen"? "Rest ye merry" was a common expression of the era. It's slang that we sing every year without realizing it.