The fruition of the mouth poison by UW, rattling in the ear, began during a talk about plaque effect on the brain in class, suggestive of incubation intent.

These three clips are exercises in what to look for:

https://youtu.be/LXmxzNPkyIs

Same film:

https://youtu.be/k1X6HARklSw

Similar semiotic:  

https://youtu.be/qezJMTbf_Zs