Nothing really as a referee YET.
But, going back a few years ( to the early 80s) playing club football, we played a team who used Man City's old training ground at Platt Lane. half-way through the first half, a drugs bust occurred in a buliding across the road, armed response teams, full riot gear the lot - shots were fired, we hit the deck. Cops got hte people they were after, we watched them getting carted off in the Hoolie Van. Ref says, "anyone hurt? OK, dropped ball then"
Another around the same time, we were playing away against a team in Hulme, Manchester. Changing sheds were across the road from the pitch, which was surrounded by six foot high fences, with barbed wire all round the top, with a gap in the barbed wire, level with the half-way line. We couldn't find the gate. Their coach says, sorry lads, you'll have to climb over through that gap. Whenever we put a gate in, the goalposts disappear!