Leave it to us to start a debate about the proper amount of scotch to pour and when, but here's my two cents as a former bartender (my memories of those days are a little hazy, so I may be wrong):
Whether the consumer is having it 'on the rocks' (with ice) or 'neat' (without), scotch is usually served in a 6 ounce 'rocks' glass. However, the amount of liquor poured is still just a standard one ounce or two, depending on if the person is having a drink or a double. For an occasion of celebration or toast, it is perfectly acceptable to serve the scotch in a one-ounce shot glass, because it is meant to be consumed quickly, not sipped. (The question here is whether it is acceptable to do 'shots' of 60-year-old scotch!) It would also be fine to toast someone with a quick shot from a rocks glass, but it would seem chintzy to ask someone to join you for a leisurely afternoon drink and offer them a shot glass to sip from.
My foggy, hazy, semi-professional ruling: Proper usage of the MacCutcheon's!
