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The lecturer warned us beforehand that the camerawork was shoddy on the video (dogs showing hyperkinesia) we were about to watch, and it was definitely a bit unsteady...
Lecturer: "... and you can see the involuntary flexing of the hindl-"
[camera completely randomly pans away from both dogs and focuses on the floor]
[a beat, while camera stays fixated on the floor]
"... erm... that's the floor."
[camera shifts slightly]
"And that's the table."
[something brown bobs along the edge of the screen and disappears again]
"Ah, there's the dog."
(The cameraman did eventually manage to locate the dog again, thankfully.)