Koen Crolla has specified a replacement for BBCode (that atrocious square-bracketed markup language for bulletin boards) called SexpCode. It uses S-expressions (think the LISP language), with ‘staches instead of the usual parentheses . Comments in this blog are now SexpCode-enabled.

The source for my comment below is {b This} is {i {u my} {o playing} with} {code SexpCode}.