The Smiths never had any arms, and have invariably sealed their letters with their thumbs. Sydney Smith
Dinosaurs are extinct today because they lacked opposable thumbs and the brainpower to build a space program. Neil deGrasse Tyson
It is one of the most effective attitudes of the neurotic to measure thumbs down, so to speak, a real person by an ideal, since in doing so he can depreciate him as much as he wishes. Alfred Adler
The simple truth is that balding African-American men look cool when they shave their heads, whereas balding white men look like giant thumbs. Dave Barry
I have said that Marinetti was.... exceptionally gifted, and I should add that I never saw him twiddling his thumbs even for ten minutes.... beside his desk he often kept piles of books in which he would write dedications.... invariably with the purpose of spreading the word about Futurism. Carlo Carrà
Never put your thumbs between two grinders. Spanish Proverb