Eat your heart out Indiana Jones! I think i have the Holy Grail of defective LEGO parts.
I managed to get a defective 1x1 round plate. Most likely it came from the pick a brick wall at the Lego Store up in Denver.
I have 10's of thousands of Legos and had never come across a defective Lego until now.
The defective plate has a slight oval shape to it and as you can see by the photo its been flattened like it was run over by a car.
It looks like the full form was molded (even the word LEGO is 100% legible on the top) but it was somehow squished during production.