I plan a presentation on a TeX conference, which should be suitable for the very experienced audience.

In the sense of this question:

* [How can we attract experienced TeX hackers to participating on this website?](https://tex.meta.stackexchange.com/questions/94/how-can-we-attract-experienced-tex-hackers-to-participating-on-this-website)

If you would like to convince TeX hackers of this site, to win new expert members, which question would you showcase? 

Though votes to questions show quality and popularity, I'm looking for expert-attracting content, so I look forward to reading your personal recommendations, optimally with a short reason.