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What started off in familiar fashion, with Asian stocks rising, and Europe hitting multi-month highs and US futures in record territory has stumbled in recent minutes following a continued rush for safety in short-dated German Bunds (the 2Y is now trading at -0.92%) and ongoing selling in the USDJPY, which has pushed Stoxx 600 back to unchanged, and S&P futures to modestly red for the session.

The exact  catalyst is unclear although traders are citing continued French political risks, as the recent OAT selloff continued this morning on Le Pen fears.

It is very fitting that on today's April 28th anniversary of the bull market, the day that officially makes this the second-longest "bull market" in history, the market got a stark reminder of just how it got there: through constant and relentless central bank intervention, which has been "beneficial" to stocks for the most part, however last night was anything but.