Comment Change the Display Language (Score 1) 695
Might not be an option for you, but if you speak any other language, just change the Windows/Mac/Linux system language to it.
I can't count the number of people who've asked to use my laptop, been challenged by "Cet ordinateur est utilisé et a été verrouillé
Also, even if people know that English is your native language, you can claim that you're trying to learn and that you've changed your computer over to get some practise with it. No need to have people think that you're intentionally trying to prevent them from using your system.