[callmeal]

I usually have fun with security challenges. And get annoyed at ones with multiple choice answers.

What's your favorite movie? -> a sexual position

Where did you go to high school? -> another sexual position

City of birth? -> something else from the kamasutra

Of course, that makes phone conversations where they ask you those security questions very fun.

[oneeyedpigeon]

Apparently, sexually explicit concepts (maybe all 'shocking' concepts?) are very highly memorable, so that's probably a good approach!