I have one on the bottom of my foot, in the shape of a lowercase 'r', Got it by attempting to jump over a wine glass when i was little, ended up landing on it (i don't know how i managed that...) and crushed it into my foot. Cue the most pain i've ever felt, having 8 injections into the bottom of my foot to numb it so they could pull glass out and stitch it up.
Also got one above my right eye from, again, attempting to jump over something...this time, a horizontal pole, cue faceplant.
Aside from that, got a few random ones from cuts and grazes, a lot on my shins from slipping pedals whilst mountainbiking.. err, thats about it.
They can look bad ass, just depends where they are/what the person that has them looks like.