You can learn plenty about people simply by listening to their speech patterns. For example, if they use a lot of complicated words incorrectly, they might be compensating for something. Which is quite endothermic, if you ask us. If someone you're talking to uses "I" a lot, they might be intimidated by you. So when you're talking to your hard-ass boss, your "I"s will probably be at an all-time high, but when you're talking to someone you perceive to be beneath you, like your dog or Bob from accounting, there'll be nary an "I" in sight.
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Aside from "Irritating" and "Idiot," of course.
In a study conducted by the University of Texas, researchers divided participants into groups, and randomly assigned one person to be the leader of each one. They then analyzed their conversations, and found that the leaders said "I" in 4.5 percent of their words, while the rest used it 5.6 percent of the time. In another study, pairs of students were made to complete a task together, with their interactions taking place entirely online. Afterwards, the researchers asked the students which of the pair they thought had more power and status, and they found that the majority of people pointed to those who used "I" the least.
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The conclusion should be obvious. If you want to excel, start speaking exclusively in the third person.