Quote from doublechin:
He places massive size to run the market like 6000 bids and offers in the bund. Sell 100 into his 6000 bid and all of a sudden it's 6000 offered. Buy another 100 into that offer and hey presto back bid 6000. Occasionaly he gets rumbled like last week when the hedge funds came into the bund on the back of GM and ford and took out 7 prices of these ridiculous orders in one trade. All of a sudden the orders were down to 2/300 lots in the whole book. Whoever got taken got a shock. This type of trading only works in quiet markets when paper isn't about. The flipper is no longer much of an issue as plenty of people match him in size and clip him in one go but a few months back he had the market in the palm of his hand.
That is one dangerous strategy. To get filled on 6000+ contracts when all you really want is to do flip 100 contracts. I don't know why some traders feel like they have to manipulate the market in order to make money.