Here is something that I find really entertaining about Ruby:

d/ruby-1.9.1p430-x8664-2.txz:  Rebuilt.
  [note, the problem described below does not seem to affect x86_64 but the
   package was rebuilt anyway to keep things consistent]
  Forgot to do the magic dance.  Thanks to Vincent Batts.
  The magic dance involves rebuilding ruby the exact same way until the
  resulting package works for this test:  ruby -e 'require "dl"'
  Eight tries were needed to obtain a working package.

This is from the Slackware-current ChangeLog. Even building Ruby is a dynamic process!