What’s the most dangerous state of matter you have seen or had

Question: What’s the most dangerous state of matter you have seen or had
- Keywords:
  dangerous,
  matter
Asked by anon-240134 to Struan, Charlotte, Isabel, Douglas, David on 11 Mar 2020.
- David Threlfall answered on 11 Mar 2020:
  
  Super hot gas called a plasma
- Douglas Bray answered on 12 Mar 2020:
  
  I don’t work with anything other than the main three (solid, liquid and gas) but plasma is probably the most dangerous.

Question: What’s the most dangerous state of matter you have seen or had