The "Illiquid Friday". Having no other things to do, the market just keeps pushing the old trend to its limits. Once we fall back to 146 or below next week we may consider the uptrend completed.
I said it before, I will say it again -- the Yen will be the only currency in the world to strengthen against the dollar during the crash in the next couple of months. While the Euro will be price-discovering its way to ~0.75, USDJPY will try to hit 100..110 at the same time. This is impossible to predict fundamentally. Only the technical analysis will lead you to this (correct) conclusion.