Those that have and those that will for sure.

I was giving an instrument check in the Navy. We were at a little airport doing a VOR that had a fairly significant course change in close. The guy getting the check was pretty focused on making the turn since we were in a DC-9.

"Flaps 15," he says. The gear warning horn starts blaring.
"What?," I asked.
"Flaps 15," he says.
"I can't hear you," I said.
"Flaps 15," he yells.
"I can't hear you over that horn."
"Shiite, going around," he says and executes a missed approach.
"Good idea," I replied.

Its amazing, but hearing is one of the first things to go when you start zoning in on a difficult problem or an emergency procedure.