What Lego part(s) would hurt the most to step on? We've all heard (and probably experienced) the long-running joke that stepping on a Lego is the absolute worst.

People have determined this is due to the bricks' high compressive strength, small size, and sometimes sharp edges.  

As far as edges are concerned, consider a standard 2x2 brick:

While the 6 faces are fairly harmless, if the brick were somehow angled such that a person put all their weight on an edge, or (god forbid) one of the 8 corners, it would really hurt.  

So the question is: What Lego part, or assembly of Lego parts, would maximize both
 (a) small size, and
 (b) sharp edges/points pointed upwards when laying on the ground?
I think this one would be in the top 5:
Tile, Modified 2 x 2 with Pin (part 2460)