Those who don't think manipulation occurs, here is a guide written by Wolong, the guy who originally pumped Dogecoin.
http://cryptofrenzy.files.wordpress.com/2014/02/god.pdf
http://cryptofrenzy.files.wordpress.com/2014/02/god.pdf
Good read.
Before the read, I was wondering why huge ask walls appear at regular intervals after a huge dump. Why sell low when you can sell high?
After the read, I am aware that one possibility is the manipulators are at the Suppressing Prices stage. I don't know about this for sure but this offers a real and logical explanation.
After the Suppressing Prices stage, the following stages follow: (1) Test Pump, (2) Actual Pump, (3) Shakeouts, (4) Re-allocation and distribution, and (5) Exiting - The Dump.