I was at Dulles airport today and saw a sign that said "SAS counters opens 2:30pm".
OK, I'm thinking SAS airlines don't fly much and the counter opens at 2:30. Simple enough.
But the sign should have either read "SAS counter opens 2:30pm" or "SAS counters open 2:30pm". Either there are multiples counters that open, or a single counter that opens.