Nukeboy: According to the Phantasm website, there was a guy using a syringe to pump the blood through the sphere. When they did the take, they had a blood clot in the tube which delayed the passage of the blood. The operator had to push the plunger franticaly to get the blood to flow. Just in time the clot cleared and the extra pressure gave them what you see on the movie.....

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All the Woes of a World by Jonathan Icknield aka The Bryster

And in my final hours - I would cling rather to the tattooed hand of kindness - than the unblemished hand of hate...