@ArrBianca it might be fine, since they'd both be at the same potential, so no current should flow
@SomeEgrets @ArrBianca Not necessarily.
If there are pins that lead to ground (i.e. an output signal), and both GND and VCC are at 5V, that means you get current to flow the wrong way. For example, a Zener diode meant to regulate voltage will suddenly have current flowing through it.
What to say about transistors and capacitors and other semiconductors?
@ArrBianca @rick_777 we put 240VAC through a parallel port once at work because of an accidental solder bridge