1000V capacitors

[ppppenguin]

Higher value low leakage caps are rather dangerous when charged to 600V.

What's more, due to stresses in the dielectic they can sometimes recharge themselves. Serious capacitors (big metal can 4uF+, 2000V+ for example) are best kept stored with a shorting link across the terminals. I've been bitten by a CRT that recharged itself and was lucky not to drop it. In that case the shock wasn't serious, it's the surprise and involuntary reaction.