I laugh, really hard - my sides hurt after a while.

Anyway, just a nitpick:

The students cringed in their seats, recognizing this signs that something
bad was about to happen. They knew their teacher well, far too well for
their liking.

Maybe something like, 'recognizing these signs as being for something bad about to happen.'

=====
My scribblings are found at my webpage:
http://ca.geocities.com/troythomas1/

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