Need any more proof that the NFL reinvents itself every season? Slightly more than a month ago, I wrote a piece on the five most unstoppable plays of 2013. Now I'm revisiting the topic six weeks into the '14 campaign, and I've only got one repeat (and as you'll see, it's not a direct one).

This is an unscientific pursuit, of course; there's really no exact metric that fully describes "unstoppability." I like to think of it as plays that show up on tape again and again. Maybe they don't work every single time, but they always stress out the defense, and failure never dissuades trying again. Plus, in most cases, the success rate is awesome.

So here's my list, in ascending order, of the five most unstoppable plays of 2014 so far. Feel free to hit me up on Twitter @CHarrisESPN if you feel like I missed a great one.

5. Jordy Nelson and the Cover-2 window.