One thing I miss from this presentation is good war story examples of unexpected or horrid things happening from UB causing the compiler to omit critical code.<p>Here are some examples: <a href="http:&#x2F;&#x2F;blog.llvm.org&#x2F;2011&#x2F;05&#x2F;what-every-c-programmer-should-know_14.html" rel="nofollow">http:&#x2F;&#x2F;blog.llvm.org&#x2F;2011&#x2F;05&#x2F;what-every-c-programmer-should-...</a><p>Anyone got any more?  Please, anecdotes help explain this! :D