Some controllers at PDX make the heavy cargo birds wait a too long time to depart. They will literaly clear the approach, pattern, and departing que until they let them go.
DHL guys spoke up: "Is there a reason why we are waiting 5 minutes in between dash 8s to depart?"
the girl with a cute voice up on the concrete throne was caught off guard: "please repeat?"
DHL: "Are we going to get the runway or should we just shut down our engines?"