CJam, <s>151 142 141</s> [140][1] bytes
--------------------


    "The ":D_]["eigh""nine"]["teen-hundreds were a time for "_]["rum.
    ""fun.
    "]]zD"two-thousands are a time to run
    a civilized classroom.
    "]AF+*

Tweetable :D

[Try it here][2]


  [1]: https://mothereff.in/byte-counter#%22The%20%22%3AD_%5D%5B%22eigh%22%22nine%22%5D%5B%22teen-hundreds%20were%20a%20time%20for%20%22_%5D%5B%22rum.%0A%22%22fun.%0A%22%5D%5DzD%22two-thousands%20are%20a%20time%20to%20run%0Aa%20civilized%20classroom.%0A%22%5DAF%2B*
  [2]: http://cjam.aditsu.net/