meaning of mundane in steel rules

In steel test and advantages on pg 363 it lists being startled by something mundane as +2 d. Is this mundane as in a common occurrence or mundane as in not magical or spiritual

I would say it’s something not actually that surprising or exciting. The cat leaping out of nowhere, a bottle falling off the bar, some guy suddenly clapping you on the back from behind.

I’d always assumed it was for being startled by things that are not magical, monstrous, supernatural and so on (of which there are quite a few in the list, after all).