Cactus, the ultimate in quality telephone-based harassment, has been around since the early 1990's. Cactus, as well as cacti, are, indeed, very sharp plants capable of terrible disfigurment and have been attributed to 2 deaths in Bosnia and 5 in The Ukraine. However, the word cactus used alone in a telephone call is not only confusing, but disruptive and annoying. Using the word cactus, one can baffle a foreigner in some far-off country like New Jersey at 2 a.m. or his driving instructor in person just as easily. Cactus has also morphed into the sub-cactus-counter-cultural-uber-1337 word, kaktuß.
Know the cactus. Be the cactus. Fear the cactus.