1960's and 1970's lego wheels had a small embedded metal axle. Depending on orientation these could cause a significant puncture wound: https://www.bricklink.

1960's and 1970's lego wheels had a small embedded metal axle. Depending on orientation these could cause a significant puncture wound: https://www.bricklink.com/v2/catalog/catalogitem.page?P=7039 https://www.bricklink.com/v2/catalog/catalogitem.page?P=7039 Never had any of these but I suspect this variant would be even worse due to the smaller area at the tip of the axle: https://www.bricklink.com/v2/catalog/catalogitem.page?P=7039b https://www.bricklink.com/v2/catalog/catalogitem.page?P=7039...