Librarians do it by the book. Librarians do it silently. Lifeguards do it on the beach. Linguists do it cunningly. Linguists do it with their tongues.
Lions do it with pride.
Lisp hackers do it in cars. Lisp programmers do it between the parentheses. Lisp programmers have to be bound to do it. Locksmiths can get into anything. Logicians do it consistently and completely.