Originally Posted by Kent_Mackem
BBC Micro - double height characters in magenta font.
That's what we had
Learning how to write a simple program that disabled the break and escape keys, then printed "dixons is shit" all over the screen with a sound effect.
Executing the said program in Dixons in the Galleries, then hiding outside and giggling at the poor salesman trying to stop it and wondering why the keyboard wasn't working.