"For the next two months, Avitzur had to find new ways of getting into the building," says the report. "He kept his cancelled badge around his neck and timed his arrival for when he knew there'd be crowds going through the front door."

His badge would fool security, but he had to be sure to stay away from sensors that would set off alarms if he got too close.

He would sometimes sneak in through a side entrance opened by friendly programmers, who also ensured that there were always two computers available for Avitzur and Robbins to use.

When Avitzur and Robbins were ready to demonstrate the calculator, just three month later, engineers informed their managers of the project, who requested to see it in action. "Avitzur was prepared for the worst -- ready to be dismissed as a loose cannon who had spent the last three months trespassing -- but the demo went perfectly," says World's Strangest.

The PowerPC computer came out the following year, complete with Avitzur and Robbins' calculator program, which has now been installed on more than 20 million machines.