- I waited ~8 hours in an ER with my mother, who had horrible gut pain that turned out to be a ruptured appendix, before they finally took her in, with an urgent emergency referral from an urgent care center we visited earlier.

- I waited 2 hours in a specialist's office waiting room, and I arrived on time. No explanation...

- We waited about an hour and a half at the vet, in a room by ourselves with our dog. Again, we were on time, but they were apologetic when the vet finally came in.

These are the more extraordinary circumstances, but definitely not the only ones (especialy at the vet).