A practical joke involving jello

Here's a delightful treat someone once made for an office Christmas party:
A gelatin mold should be made with Knox Unflavored Gelatin and red food coloring. One would think that a flavorless food would not be at all difficult to swallow, but believe me, from the looks of people who inserted cold masses of gelatinous glop into a mouth that was expecting sweets, the experience is unexplainably horrifying! Some claimed to be nauseated by the feel of it; others politely swallowed.

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