Since you asked...That came from our local bartender who happens to be profoundly blind. No worries though, he swears he can tell the difference between the drinks by putting his finger into the liquid and by all accounts he’s right well accurate.
Now the more fastidious reader might say this is “unsanitary” but the barkeep has very clean hands despite working at the garage and putting in cheap pace makers during the day.
Besides, he licks the booze off between drinks.
Whatever you’re drinking, I’ll have one, too.