*You know: avocados/guacamole, mayonnaise, Vegemite. The usual suspects. Grrrrrrr.
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In 1982, German psychologist Krause Wolff performed an experiment where he placed random objects near patients and recorded their reactions. One patient developed hives on his left forearm when he was shown a photograph zucchini schnitzel. Another patient developed a severe rash on her legs and thighs when shown a photo of Pommes Frites mit Majonäse. Neither patient showed any reaction when fed the items (whilst blindfolded).