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Here is an odd piece that I have found - any idea what it is? 2x2 plate is shown for scale.
It's a LEGO brick Separator tool. Mostly used to preserve the structural integrity of the human nail, teeth, gum line etc...
Watch the classical use of it here.
Here's a recent post of some unorthodox uses of the Separator tool.
To expand on a previous answer, it is the original brick separator that was produced between 1996 and 2011 in two colors. It was replaced in 2012 by a different part with the same name and purpose but slightly different features.
Required, but never shown