[NicknamedBob]

"And what if it's niether? "

In that case, you fall back on the secondary rule;
Only drink when it's day or night, or somewhere in between.

These rules courtesy of the song "Belly up to the bar, Boys" from the musical, "The Unsinkable Molly Brown."

[Irish_Thatcherite]

You don't leave me much room to maneuver!