Recent Dogecoin pump on Poloniex took this coin (which by the way was called "a joke" by its own creator) to all-time highs in US dollar value.
I assume this price increase happened due to large Bitcoin mempool. Let me clarify - people do not want to wait tens of hours for BTC transaction confirmation and pay ridiculous fees for that. Some of them, therefore, decide to use "good old DOGE" with almost instant transaction time and extremly low transaction fees comparing to Bitcoin. This drives the demand for DOGE and price goes naturally up. My assumption is backed by rising number of transactions in every DOGE block.
Dogecoin could easily go even higher considering above mentioned situation. Anyways, DYOR!