Neutral and live holes/wires
In North America, Japan and most other countries,  Neutral is always Earthed at the D.T. ( Distribution transformer ) ... It also may be earthed at residential plumbing for underground copper pipes.
  
  
  In (most of) Europe 2 of 3 phases and grounded neutral are provide to residents 400/230Vac
  In America only 1 of 3 phases is used per household and is split with centre-tap neutral-earthed 240/120Vac called L1 &amp; L2 with 240Vac differential or 120vac with respect to neutral, while Europe using 2 of 3 phases the differential voltage is (root3) * 230V = 398Vac approx.
  
  
  
  "The purpose of grounding the electrical system as stated in NFPA 70: National Electrical Code (NEC) is, “To limit the voltage imposed by lightning, line surges, or unintentional contact with higher-voltage lines that will stabilize the voltage to earth during normal operation.”


Power distribution is regulated in countries with good infrastructure to 5% for transmission load variation and 5% for distribution.  

In split phase delivery in America, since Neutral carries the return current for both L1 and L2, the voltage drop is expected to be less or near zero, if they are balanced. If notm then an voltage difference drop of up to 5% can occur when the breaker panel is loaded on one phase only with I^2R voltage drop from this imbalance.

We do not see much here, but your location is different.

Appliances using a 2 pin plug must be "Double insulated".

The possibility for Neutral to rise with lightning transients is greater with exposed power lines.

However that being said, there are line filters which conduct EMI noise pulses to ground to reduce interference and on laptops this ground barrier stops in the external battery charger and is not passed onto the laptop case ground, so the laptop is "floating" and limits ground current from lightning transients by the quality of the insulation.

i.e. your laptop is never grounded, unless you connect it externally.

But due to the high frequency noise currents to ground ( up to 0.5mA permitted) you may experience a tingle if your laptop touches a sensitive body area like a wrist or kneecap when your feet are wet or hands earthed to plumping and you bump laptop on counter with your wrist. It can also degrade external mic noise with hum until the laptop case is grounded say thru the VGA port to a external monitor. This makes the EMI common mode noise much less for the high impedance mic but also increases risk for ground faults but unlikely in a redundant grounded stationary monitor.

I hope that makes sense....