[morzh]

160uF, not 330uF. Anywho.

Well, the full energy of that cap was 9 joules.
Joule is a serious energy. 9 Joules over a second is 9W, and 9W could heat some measurable things to red-to-white hot state and some smoke.

BTW, James Joule was a brewer before he became a scientist; the science was a serious hobby of his, and the brewing was the profession, handed down from generations, which made his family rich. And it was brewing that lead him to science - measuring energy, temperatures and such.

And, to finalize, the capacitor is a magic thing. To charge capacitor to the energy level, say, E, the power supply needs to expend the energy of 2E. Hence the famous two-cap paradox. And the spark is that very result of it.