I have a number of favorites from the past 10+ years but, without a doubt, this one should be considered a classic: http://www.flyertalk.com/forum/trip-...lhr-plane.html. Pure comedy genius. A more modern iteration of a similarly awesome style is here: http://www.flyertalk.com/forum/trip-...hrooms-me.html.

You can also search for "unmitigated," "upgrade flirt," or "stink shield" in the CO forum for some pretty good stuff. The thread about "wing glitz" (TBuzz, I believe) was pretty awesome, too.