So this is not uninteresting:

[WestMichRad]

39. Many years ago I witnessed something very similar

… when I spent a full day with my father. It was very out of the ordinary for him. Found out several days later that he had suffered a mini-stroke that led to this impairment.

Fortunately for all, it didn’t appear to have any long duration effects… he was very lucky. Lived another 25 years in fairly good health throughout.