Example 1: The obvious stop
A trader shorts at resistance and places a stop one tick above the obvious swing high, where thousands of similar stops rest. Price pushes just through the high, triggers the cluster, and then reverses hard in the original direction. The trade idea was right, but the stop sat in the worst possible place and was taken on the poke. A trader who placed invalidation beyond the liquidity, allowing room for the spike and anchoring to the level whose break would actually change the read, would have survived the poke and kept the move. The idea was identical; only the stop placement differed, and it decided the outcome.