In Star Trek Beyond, a few days before the anniversary of Captain Kirk's father's death, he and Dr. McCoy have a sip of 30 year old scotch taken from Chekov's locker. Bones pours a finger into 3 glasses. I assume the third glass is to remember George Kirk. Then he makes a toast: "Here's to perfect eyesight and a full head of hair." Wha?!
In TOS: the Corbomite Maneuver Bones serves Captain Kirk something that might be scotch. Perhaps he was going to make a toast but Yeoman Rand interrupts their conversation with a salad - of all things. There are other countless times when they have a drink, but a lot of people draw a parallel to the Romulan Ale they share in The Wrath of Khan.
Whatever the time, I don't remember Bones ever making a toast. Is this a reference to some previous toast I can't remember? Is this a nod to the glasses Kirk had in Star Trek IV? Is it a joke about Shatner's toupee? Anyone have any insight?