[hilbert42]

"She would have had to have been being watched."

Wow, whoever concocted that mind-twister? That's the sort of problem we students would have given our formal logic lecturer to analyze and draw up into truth tables.

That expression likely exceeds the complexity of an infamous expression (known for its complexity) that was given to us students to analyze, it being 'there is a chance of a possible maybe'.

It hurts my brain just thinking about it, perhaps I'll do so later. ;-)