This comes from an attempt to write valid JavaScript without using any letters or numbers. It's partly for the sake of demonstrating it's possible and part for security testing reasons, to show that poorly written input validation filters can be bypassed.
The correct interview question is, “Write a filter that blocks executable JavaScript but allows text.
I would hire you on the spot, my post history is littered with how irrelevant these type of questions are to gauging ones ability to develop real world solutions. You pretty much summed up the irony nicely.
