>75 mA across the heart might be fatal. An AC motor capacitor would probably just give you a short shock since it's only used to introduce a phase shift on the

>75 mA across the heart might be fatal. An AC motor capacitor would probably just give you a short shock since it's only used to introduce a phase shift on the auxiliary phase in single phase AC motors (what the OP is talking about) or for power factor correction in 2/3 phase AC motors. AC switches every 20 ms from positive to negative so the cap only stores very little power. I'd be more weary of capacitors in DC circuits.