A tumbler is considered to be a general term for any drinking glass without a stem, which would give Mr. J some considerable leeway - unless we could establish that it was a WSL glass of a standard size, of course.
'-)
Michael, I agree, he was fairly conscious of what was going on around him. I don't believe, though, he ever said anything about his alcohol capacity. Somewhere I recall reading a comment from an acquaintance to the effect, "that man loved his grapes."
Roy