Before the BOJ monetary policy statement announcement on Friday there were several huge spikes in the USDJPY pair. The spikes lasted literally seconds:
Apparently, these spikes are being caused by computer trading algorithms. I think a good strategy to take advantage of these “flash” spikes is small off the market orders. Of course there is the potential one may not stop and just keep going. But it seems if you catch a few successfully and one fails that would be all right. Worth looking into anyway.