https://en.wikipedia.org/wiki/Total_creativity
http://www.see.org/e-ms-dex.htm
http://www.multivax.com/last_question.html
http://www.catb.org/jargon/html/koans.html
https://en.wikipedia.org/wiki/Closed_timelike_curve
And here's something terrible from the wiki page on koans that made me laugh:
“If you have ice cream I will give you some.(It is an ice cream kōan.) <-- T_TIf you have no ice cream I will take it away from you.”