I used to mess about with
lets just all it very rapid and energetic diy chemistry. Wouldn't recomend it particuarly in todays climate.
Most stupid thing I did was got something to react with a something else (don;t think it would be a good idea to give the recipe on this site , the germans ditched this combo as too unreliable and too vigerous during WW2) , on my desk in my room
Desk got a big burned hole, there's still burn holes on the landing floor boards at my parents house. filled the house with smoke. don't know which was the more violent reaction. the 2ft roaring purple flame o my desk or my mum
Mind you a friend tried some thing once. Ever seen a mole cough?
this sort of thing is just too risky