Ever learn your lesson the hard way?  Of course you have.  We all do.  But what lessons do you seem to have to learn the hard way regularly?

Backstory: I learned a couple years ago about the virtue of arm warmers.  In particular, I love SmartWool brand arm warmers.  And it's been "arm warmer season" now for pretty much two months.  So I've put them on quite a few times already.  But like last year and the year before, at some point, the inevitable happens....

You see, if you get in a hurry putting them on, you'll try to pull them up a little too fast.  And you're usually looking at what you're doing, and pulling them up fast once they get near the shoulder means you're likely to let it slip...and BLAM.  You punch yourself right in the nose.  Not hard enough to do damage, but in my case it seems like it's always hard enough to make my eyes water. 

So, arm warmers are awesome.  Just be careful with the installation.  The world is dangerous enough without senseless violence that could be avoided if we all just take our time putting our arm warmers on.  And by all means, if you're going to learn this lesson, try learning it just once, not every year like SOME people I know.