This short video shows the results of two electrolytics and a tantalum capacitor with reversed polarity and modest voltage overage. The 10 uf tantalum cap not only explodes but burns very nicely afterward. One of the electrolytics manages a really ferocious bang but, to be fair, it's 470uf.
He's running 15V reversed into 10v caps but I bet that's not the important factor.
Excellent, all beginners should see this. ;D
This is why using tantalum capacitors in a power supply or for supply decoupling is not a good idea. Even when they are connected the right way round they can fail short circuit and burn like that.
"I know! Lets blow some **** up!"
this guy is funny.
That is such a hilarious line.
And I learned something, too!:
don't connect caps the wrong way at 5v higher than they should be.
Great advice!!!
Haha!
"Here's a cap without a vent on top! Is that gonna f*** us?"
At least, that's what I thought I heard. 
We used to do this in college lab classes. Shoot them off the breadboard and into the celing. ;D ;D ;D
More like 14 volts too much :
He clearly says at the end that you shouldn't go past a volt or a volt and a half when wiring em up backwards =P
That guy is rather energetic, isn't he?
The tant cap was interesting to watch. You get an explosion, and then "oh look, it's on fire."
Then a few seconds of not much action.
Then, suddenly, "oh DANG! It's REALLY on fire!" :o :o :o