Avitzur, who was 27 at the time, was disappointed when Apple shelved his project. He was offered a different job within the company, but it didn't interest him. He wanted to make the graphic calculator work on the new PowerPC computer than Apple planned to ship in early 1994, and he was determined not to let anything get in his way.

So, when he realised that if he didn't submit his final invoice, his contract would remain on Apple's systems and therefore keep his ID badge active, that was exactly what he would do in order to finish his project.

"On the first day Avitzur came to work without a job, everything was pretty much the same," reports . "He drove his 1987 Toyota Corolla from the room he rented on the edge of a nature reserve in Palo Alto and parked in the lot outside Infinite Loop, Apple's fancy new headquarters. He swiped in, went into his old office, and resumed working on the calculator."

It didn't take long for Avitzur to gain a helping hand. Greg Robbins began reporting to Avitzur when his contract was almost up, and despite not getting paid the pair enjoyed the challenge.

But, they became careless and got caught, causing a manager to revoke their ID badges to prevent them from being able to return to the offices.