"Found lots of these little things buried in the ground whilst digging out foundations for an extension in the UK. The white around the edge is some kind of plastic and the inside seems like charcoal, but could be something else. Anyone have any idea what they are?"
A: "They look like individual cells from a battery."
It's a toy missile. I had a million of these in the 80s when I was all about Transformers. The color also makes me think it's part of a toy. You would insert it into a launcher, a spring would get stretched out as you as you loaded the missile, and once it's fully inserted that hook on the end would catch onto something securing it in place. You would press a button somewhere on the toy releasing the catch, and the tension in the spring would send it flying.
what do you expect. they are anecdotal answers from reddit.
Close your air/sound hole thingy please.
Are you high?? Laser alarms were HUGE for a couple of decades.
For Bloody Marys.
replace it. costs nothing but will keep your mind at ease