Sell! Sell! Sell!

That headline is tongue and cheek. ... Who knows if the market is overextended? We could be in the midst of a pretty good rally following the sell-off, so selling/shorting could be a mistake.

But the 3%-plus rally of the last week--especially in weak sectors like energy, materials and emerging markets--could portend a nice shorting opportunity. At least in the short term.

That, plus the fact that we've had a helluva run-up in 2013 followed by a nice rise in 2014 and now market looks like it could be rolling over.