Lutz, while what you are saying is true, in Argentina we have a saying "Estás meando fuera del tarro" ("“You are peeing outside the jar/can”) as it has nothing to do with the thread, which is about short circuiting logical operators, nothing to do with the differences between procedure and function or parameter changing (there are no changes in the parameters in the example), that is what is startling Gregory.
"The five senses obstruct or deform the apprehension of reality."
Jorge L. Borges?
"Premature optimization is the root of all evil in programming."
Donald Knuth, repeating C. A. R. Hoare
"To die for a religion is easier than to live it absolutely"
Jorge L. Borges