LMFAO! it's not nice to strike back at criminals. Now I know how to fuck up HFT, you place big trades and cancel them. The algos will go crazy just doing that because that's their strategy. Then to make it more fun, you do a technique called a wash trade. This requires coordination by having one party buy a stock and another party sell it simultaneously. And then, my favorite: front running trades. HFTs main strategy.