Undefined behavior can result in time travel (among other things, but time travel is the...
The C and C++ languages are notorious for the very large section of the map labeled here be dragons, or more formally, undefined behavior.
Hasnain says:
This is really cool. As well as the two linked article series on undefined beaviour in C/C++
http://blog.llvm.org/2011/05/what-every-c-programmer-should-know.html
http://blog.regehr.org/archives/213