My attempt to discuss the cultural differences between Eater here and in he UK, we ended up solving fun and tricky math questions, here's a great blog with a lot of them:
http://dailybrainteaser.blogspot.hu/search/label/Trick%20Teasers?refer=self

These questions reminded me of magic tricks, which often use the same principles as tricky maths questions: some weaknesses of our thinking, our lack of critical thinking or rather the fact that we over generalize things and fail to pay attention to detail:
https://www.youtube.com/watch?v=23GgDanyppU


We also found this old book:

It is written in a language that seems to be a cool resource for further exploitation :)