Throw a huge amount of mining power at the coin, stop mining until the difficulty decreases again, rinse and repeat. Difficulty drops to a level where the added strength makes a huge impact...
That's a scenario where you get difficulty waves like happened to Namecoin for a while, but it doesn't blow through huge numbers of blocks.
Let's say you come online with an absurd amount of hashpower and mine through 2016 blocks in 1 minute. Great, huge head start! But then it retargets to something absurdly high. Your choices: either keep mining at that rate (and thus generate the normal 2016 blocks per half week); or pull your hashpower offline (and then fail to even get to the next retarget this year).
The waves result in a SLOWER overall block rate because the down-cycles end up being extremely long. You won't get 100k blocks per month this way.