Rickrolling lyrics were mined several times into the blockchain.
The first currently known instance is as a link right during the prayer wars on block 142573 (2011-08-25) as the miner message:
Militant atheists, bit.ly/naNhG2 -- happy now?"
which redirects to www.youtube.com/watch?v=mGDuExhS6Nw&blockchain
Around block block 246k (e.g. 27b7c526489dac8245747fa1c425a2e3eb07dea57b294eb4ae583fec9b859fcf, 2013-10-17) we note several transactions starting with a XML format <CG SZ="1156"><MG>... the first one being 0b4efe49ea1454020c4d51a163a93f726a20cd75ad50bb9ed0f4623c141a8008 As mentioned not very clearly at www.righto.com/2014/02/ascii-bernanke-wikileaks-photographs.html#ref12 the content of the first <MG><payload></MG> is a Base64 encoded string
Catagory: Poetry
Title: Never Gonna Give You Up
Performer: Rick Astley
Writer: Mike Stock, Matt Aitken, Pete Waterman
Label: RCA Records
followed by lyrics also base64 encoded as part of the XML metadata. Hidden surprises in the Bitcoin blockchain by Ken Shirriff (2014) was not able to identify the exact format either. At twitter.com/EMBII4U/status/1655831533750562816 EMBII mentions that this was part of an upload test.
tx 15b11e8d4e5b9425f024b381ba0cb7a54a35e52389bb4855f505772ce685b39c (2014-06-24): starting from this transaction, the lyrics were inscribed several times via input scripts. Then again:
  • 8bb9db70e24202fdfd0e48b57a11a407e6c8c0e76d879634b801b4345b8810b2
  • b881afa519804a3c93a3c99481517ca8ae070b84c04e8e7a2bfb808e043f9771
  • 70c8405bd0ec10bea49b78a819dfbf46c1082e7e620588f9da65a90b71e52bbd
  • fc4e382793757858bec4b87527caa4bf2e6f71bb2f5a77bb41a45ddb9ed9d409
  • f011e71b711aa54a0c824244fff83fb8b1e1921804624fa0523a6e61612b7f6f
  • a8691cdbca5b82e4e48812e48b7a09e4757801fd3909a09975de957d1bfb52dc
  • d8946aa464be464674bba6d15729d75572ec75dda49fe7ff0ede1a25ca054941
  • d02864cd57c9d041dbd9d6f24327f347b92697a8bc3c86cdf8b738063c6ad002
  • 9b78962d840f1ff681e5042264e4d0359cda98ce49d97569df14ce956622b966
  • 7bdc22fb35f0a8eb6241782a306a8904fb6f793126ff106a04a96f9f223cb8e1
  • e24a4085c54a6362e615f8eab758c12d80e488b73757e6d2b8ab6bfc8be7007e
  • 4257f4980955d8376ee1c6bccb4396da726e4ae13d758e47dc4e0775019723f5
  • a09b49e9374d43386a6a986944e3dcf515c7e1c38324836df5333b8adbe57797
  • 03096688dbb874f7c571691e4241a298284bf4184be339b148f1b48f383a1d7c
  • 62f8b228b6126354736d36d9f3b91882bb81eca7702b74fba6471abc7db96a03 (2015-09-30)
They were mega obnoxious!!! Who does this kind of crap for more than one year!!!