Spot the problem when demonstrating basic diode behaviour...
@_thegeoff I'm a bit rusty on my electronics, but my assumption would be that despite both not being connected ground wise. They are via the ACs earth.
And potentially just enough resistance provided by the scope to "complete" the circuit?
@Ryanteck Yeah, my guess too, internal earth. Modern scopes are sometimes to clever for their own (or the operators...) good! I may need to Read The Fine Manual better ;)
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Even old scopes connect their ground to PE (I once melted insulation on a breadboard jumper by connecting scope ground to +5V from a lab PSU that also grounds negative side of its output.)
