Wobbly knees when squatting

[BeEfNBrOc]

Sooooo, when my I get to my work sets for squats, my knees start shaking like something in terrifying(or beautiful) is standing in front of me.

I focus on trying to keep my legs perfectly still, but after a certain point it inevitably happens. Is it a weak link in my muscle groups? Am I going too heavy? Am I just a pansy?

[convergentsum]

Interesting question. My recent non-heavy squats have been wobbly, even on warmups (i have been under the weather though).

[KyleSchuant]

Video.