Bought new inline skates (K2 Enemy) last week, figured I'd give aggressive skating a try. Started out just skating around a bit to get a feel for them and tried a few jump/spins. Turns out that this isn't such a good idea on Boston sidewalks as the tiles tend to not be flush with each other but rather tend towards random jutting here and there. I managed the 180 but my right skate landed right where one tile jutted upwards a bit (not much, but enough) and "tripped" me throwing me off balance. Now, normally when I catch myself I land open-handed, but this time for some reason I caught myself with the back of my middle three fingers on my right hand and pretty much got the skin sanded right off.
(Note: aggressive skates have wheels much smaller than normal inline skates (55mm vs ~80mm), so getting tripped up by small rocks/sidewalks jutting up etc is much easier/more of a problem).
Lesson to be learned: don't pull a fejj.