actually, i've seen caps from that series "go off".... it's not as spectacular as you would think..... the little rubber plug in the plastic end cap pops and clouds of smoke spew out with a loud hiss (think smoke grenade) and that's about it... the particular caps i saw do this were the 15000uf/80V ones that were used in an amplifier.... somebody on the assembly line had wired them in backwards, and after an hour of trying to figure out what was causing high current on this amplifier, i decided to do a smoke test (bypass the variac fuse and the primary fuse) and see where the problem was.... i found out rather quickly.... after the smoke cleared i found that a newbie on the assembly line had wired BOTH of the caps backwards, along with the rest of the day's production having the caps in randomly (only 4 possibilities, both correct, the + side correct and the - side backwards, the - side correct and the + side backwards, and both backwards)...