I was never an Angry Young Man. I am angry only when I hit my thumb with a hammer.

-Amis, Sir Kingsley
  Dissociating himself from that literary grouping, in The Eton College Chronicle,  Jun.

In the absence of any other proof, the thumb alone would convince me of God's existence.

-Newton, Sir Isaac
Attributed.

The fact is, there are no rules and there never were any rules, and there never will be any rules of musical composition except rules of thumb; and thumbs vary in length, like ears.

-Shaw, George Bernard
Music in London,1890^1894.