I'm in the habit of using "Bollox!" instead of "Hello World!" as my first program example when reviewing a new system (blame my upbringing). Back in PCW days, around 1983, was given Tandy's Model 100, an early handheld computer to review, and time being short had to take it straight to the photographer's studio. Regrettable it still showed "Bollox!" clearly on its small LCD screen, but no-one noticed till after it was printed. Reprinting is surprisingly expensive.