a month or so back, when I was filling up my rental car near IAD at ~T-2 hrs before an evening flight to SEA, I got a text message that the departure would be delayed an hour
GA said the delay was for “Customer Service”
it turned out that SEA baggage handling had mistakenly loaded a dog in cargo onto the IAD jet, so the ground crew at IAD were going to give it food and water and a nature break before loading it back on the return flight (where it would hopefully be sent onward to its proper destination)