Perl OOP: TMTOWTDI (aka. Object Oriented Programming: there's more than one way to do it)
Only of interest for perl programmers, and from 2003 so there's some chance you've seen this before. This node at perlmonks is beautiful, even if it does illustrate the rampant re-invention of wheels that mostly defines perl culture:
We have our own style of objects in bOP. At their core they're all blessed array refs, but it's not quite as simple as that.