I have a script that does takes an IPv6 address and displays it as dotted decimal that I like to bring out any time this discussion pops up. As an example, Facebook's IP address:

  $ ./ipv6todecimal.py 2a03:2880:f366:1:face:b00c:0:25de
  Your IPv6 Address is: 42.3.40.128.243.102.0.1.250.206.176.12.0.0.37.222

Or good old 2600::

  $ ./ipv6todecimal.py 2600::
  Your IPv6 Address is: 38.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0