Sylvia's experience is 100% normal. I've even modelled it in the past which is why I reckon the Y cap between the rectified pri and sec sides is 2n2.
I was myself at the time specifically interested in the value of the leakage current and its waveform shape. It gives a great 'buzz' with lots of harmonics in poorly grounded audio systems. The audio groups regularly get a question why their laptop buzzes on the mains but not on battery power. About once a month on average.
Cue EMC discussion ?
Graham