Indescipherable Ferrets
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Another possibility presents itself. A low-budget quickie, perhaps Teenage Exorcist simply could not afford professional rat wranglers. As films like Willard (1971) and Ben (1973) demonstrate, directing rats requires more than simply letting them loose on the set. In this scene, for example, untrained rats would most likely flee when confronted with three towering humans descending the staircase. Only a "pro" would hit and remain on his mark at the center of the frame. Could it be that the producers, unable to access adequate rat talent, simply opted for a more manageable "look alike" scenario, employing someone's docile pet ferrets from home as rodential body-doubles? The line of dialogue lends support to this thesis as the woman descending the staircase clearly understands them to be rats and treats them as such.
But the insert apparently contradicts this assertion. Perhaps we are meant to see that the character has clearly misidentified the animal, which is not only "comic" (albeit slightly), but also positions this character as somewhat stupid. And yet the film offers no additional evidence in this respect, no other malapropisms or misidentifications in the script that mark her as particularly ditsy.
Much of this ambiguity hinges, of course, on whether or not an audience in 1991 would recognize a ferret as a ferret. Here we must turn to the Wiki-gods for information on the history of domestic ferret distribution:
In the United States, ferrets were relatively rare pets until the 1980s. A government study by the California State Bird and Mammal Conservation Program found that by 1996, approximately 800,000 or so domestic ferrets were likely being kept as pets in the United States.
Given this "likely" population, would a viewer of Teenage Exorcist in 1991--most likely a teenager himself--recognize a ferret when he saw one? Had ferrets achieved enough visibility on the terrain of popular pet culture by the early 1990s so that a filmmaker might dependably employ one for a cutaway gag (however poorly staged)? Perhaps ferrets themselves, as relatively recent additions to the North American roster of domestic pets, enjoyed a more fearsome reputation in this era. But Wiki suggests this is unlikely:
A United States government study conducted by the California Department of Health Services on national pet attack statistics has found that 452 reported incidents of ferret bites during the 10-year period 1978–87. By comparison, pet dogs accounted for an estimated 585,000 injuries that required medical attention in the year 1986 alone, with the total number of pet dogs in the United States in 1996 estimated at 55,000,000 and the total number of pet ferrets in the United States in 1996 estimated at 800,000. Adjusting for the proportionate ratio of dogs to ferrets in the United States of 68 to 1, dog bites occurred 5 times more frequently than ferret bites.
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Still, given that the director took the time to pick-up a ferret insert, I think we have to assume that Teenage Exorcist's ideal spectator is supposed to see the animal as "not-a-rat," as an animal of another order. Staging a ferret-as-rat illusion, after all, would be better served by remaining at the more deceptive shot scale, not unlike John Ford's handling of the crucial murder scene that structures Young Mr. Lincoln (1939).
A final possibility. In Tod Browning's canonical adaptation of Dracula (1932), armadillos and opossums wander about Dracula's castle, ostensibly as "unnatural" and thus horrifying animals. Jonathan Harker and the city folk of the thirties who had never seen such creatures before were no doubt meant to shiver at the sight of these weird creatures. Both armadillo and opossum, after all, occupy that liminal zoological zone between the oddly cute and the manifestly disgusting. In this tradition, perhaps the ferrets of Teenage Exorcist appear wholly as a sign of animal Otherness, uncanny creatures that serve as befitting sentinels for the entrance to Satan's lair. They are like rats, and yet somehow distorted, perhaps evoking the idea of super-rats or demon-possessed rats.
More competent narration would have aided us in sorting out these ambiguities; that is, of course, if we assume narrative legibility to be the primary goal of Teenage Exorcist. As it stands, we are left haunted by a certain indecipherablity in these creatures. Why have they suddenly appeared? Which genre logic motivates them? Are they shot for maximum clarity or confusing obfuscation? Are we meant to be amused or horrified at their appearance?
It would seem these are to remain among the cinema's many unanswerable questions.