If your blood pressure should become dangerously low, say at your arm, just imagine what's happening in your brain. Maybe this is what they mean by heintz-sight?

Ketchup Brain

In a state of no perfusion
You'll see ketchup brain ensue,
As the viscosity of blood flow
Becomes a sludge like glue,
And the lubricated bearings of your thoughts
Begin to smoke,
While you gain the realization
It's some crazy, cosmic joke.

As your window of perception
Is reduced by each degree,
You'll begin to beg for mercy
Asking God, why pick on me,
And a league of minor angels
Sing in harmony this refrain,
"We're conducting an experiment
To study ketchup brain".

Fibril_late; 9/93