Hutkikz:
Ahh the memories of when I first learned that.
When I was in high school (1971-1975), I used to hang around the machine shop (they wouldn't let me take shop because it was for the "dumb kids").
Anyway, the shop teacher used to shut off all the breakers at the end of the day (no power to machines, lights, outlets... anything).
So, being the prankster I was (am?), I took a handful of radial lead electrolytic caps of 1000 uF if I recall and plugged a bunch of them into all the wall outlets.
Big surprise, lots of bangs, smoke and paper confetti the next morning!
That's where I learned what aluminum electrolytics smell like when they explode. 