Here is the link to a short animation of Comet Lovejoy image sequences recorded from the outer suburbs of Sydney during the nights of 18 to 21 December 2014.
http://youtu.be/T3QgcyEsiwU
The Vimeo movies recently posted by others are more beautiful. However, this is a fun video to watch once or twice for its scientific value.
The the tail structure of this comet changes rapidly from one hour to the next. Sometimes, I even have a sense of the multiple jets rotating, possibly due to rotation of the source regions on the nucleus.