Dear Year 7
Changing your fellow students’ desktop background to My Little Pony without their knowledge is only amusing in exactly one circumstance.
That circumstance is “when I do it.” *
If you decide to ‘borrow’ their password, log on in the Library when no-ones looking, and muck around with their account, that is what people in the real world like to call “an offence under section 1 of the Computer Misuse Act 1990”.
(And while you’re here, enough with the Wikipedia vandalism already.)
Love and kisses,
* as a friendly reminder when they forget to log off.