Video calls are great when they are prearranged, but a nightmare when they come unexpected.

I once worked in an office that upgraded the phones to some sort of smart desk phone which had a proprietary video calling feature - it only worked between the same kind of phone and came on automatically. We rarely ever used it because so few of our contacts had the same system. But one time I called someone who did have the same system, and we both had looks of horror on our faces when we realised the video had started!