I failed to replicate a simple sample circuit of a N-Channel MOSFET originated in AllAboutCircuit on LTSpice. The current on the load resistor (to mimic the ammeter to measure current on LTSpice) either is in the pic-Amp range (not conducting current, or completely depleted) or in the hundreds of Amp range (the depletion region is enhanced so much?) depending on the polarity of the DC Voltage source (polarity should not matter for MOSFET on Drain and Source). There should not be any voltage difference between the gate and source as both are common out with zero bias voltage.
I have attached below the excerpt from the tutorial and the result I got from LTSpice simulation. Hope someone can help explain what I did wrong and why I am seeing these two drastically different V-I plot. Thank you.