OK - it was just a marginal delay.

We were in a 16 seater jet at the end of a runway at Kruger in South Africa. Pilot announces "we have to hold here for a moment, there is a giraffe about to cross the runway".........."OK, we can head of now".

He revs up the engine, accrelarates for 2 seconds and hits the brake. "Sorry about that - a second giraffe has now decided to join the first giraffe on the other side of the runway". At which point he has to taxi the plane in a complete circle to return to the end of the runway. We could see a jeep head off in the direction of the giraffe to hurry them on their way.

Second time lucky, we acceralarated and sped down the runway. As we were taken off, I could see one giraffe with a very indignant face glaring at our jet.