Legos.

My scalp is tingling in sympathetic pain just reading all of these stories!
I also voted for an "other": two years ago I put these tiny wooden sailboats in the kids' goodie bags at my son's birthday party. We still have a couple of them around only their sails came off ages ago, so now they are just little blocks of wood with evil evil tiny masts sticking out of them waiting to puncture your foot. I wanted to die when I stepped on one.
ETA: Oh yeah, that Schleich triceratops is a killer too!
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