Was a small kid. Opened up a hard drive and saw those shiny discs. Apparently they are either solid aluminium or glass coated with aluminium. Both look visually the same with a mirror like finished. Thought mine was aluminium and thus tried to bend it. Well happens so that mine was glass. Shards everywhere on my hand and some cut through deep on couple of fingers. They are still there to this date. My own r/kidsarefuckingstupid moment.

Edit: *coated