The Subject Was Champagne (Bottles).
You can split a half, but a split can’t really be split at all. Or at least not in a way, which would leave both parties satisfied.
A half is 375 ml, which is half of a regulation-sized bottle of Moet. A split is 187 ml, which is 2 ml shy of being a quarter of the 750 ml bottle.
A split is half of a half. A split is also a quarter. Referring to a tiny bottle of champagne as a ‘quarter’ isn’t the slightest bit alluring and it has drug connotations.
A split is decidedly sexier sounding than a quarter. A quarter, for all intents and purposes, is too practical a name for 187 ml of sparkling white wine from France.
Now that all that is out in the open, my only other comment would be:
Dear Franco-fanatic Americans Distributing Tiny Bottles of Wine,
Split and Half are synonymous. Or they’re close enough for James Bland
“The band is split, half and half,” J.B.
-The Neapolitan Mastiff
 Moet, despite being a French company, has a Dutch name. Therefore, the pronunciation includes the letter ‘t’. If you mention it without the ‘t’, I won’t have the slightest idea what you are talking about. It’s like talking about beer only calling it bee. Get it?
 This quote may be of no relevance, but that’s irrelevant.