I saw the D&D template earlier. That was hysterical.
I had not seen the markdown Beamer proof-of-concept. Very cool. Overleaf is the single best thing that has ever happened to my collaborative authorship skills, partly because Google Docs doesn't have a decent equation editor ;-)
https://twitter.com/overleaf/status/763395560682364928
and for something more light-hearted, here's a D&D template in LaTeX!
https://twitter.com/overleaf/status/763524947339800576