An anecdote from one of my former physics professors was that there are theories that PMBs are being constantly generated and annihilated near-instantaneously a

An anecdote from one of my former physics professors was that there are theories that PMBs are being constantly generated and annihilated near-instantaneously all over the universe and that odds are astronomically low but one could form inside your body and be so far away from the nearest subatomic particle that it would starve out immediately. Of course, the very concept of a black hole is still technically only the "best theory" to explain observed gravitational and radio anomalies, so it's always helpful to remember as a layman how distant from us this stuff truly is.