I'll try to locate one of the better examples I saw a few months ago. In the interim, try googling for 

("Objective-C" OR cocoa) method (replacement OR rewrite)

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Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
"Too many [] have been sedated by an oppressive environment of political correctness and risk aversion."

In reply to Re^3: Motivation for replacing object methods at runtime by BrowserUk
in thread Motivation for replacing object methods at runtime by Narveson

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