> i wouldn't sweat it. people design those interviews to make them feel better about themselves rather than as an effective way to gauge someone's aptitude to work there.

Same reason I dislike that sort of interview. Of course the thing to do is to throw in a spanner.

"Hmm, so I guess you didn't read about the Modified Banach-Wiles-Kolmogorov algorithm? I thought that was where we were going. Ok let's do it your way."

Throw this bomb on the way out, of course.