I saw something similar to that once, but I disremember where, exactly... So I just did a Google Search for "Finger Scale", but I can't post the results - this is a family forum.
I'm talking about fingers held horizontally, to show how deep to fill the glass.
But we are talking about Ted Kennedy and with the way he's been braying lately, he may just be holding the fingers vertically, one over the other, to show how much Scotch he desires.