I've become pretty good at catching myself over the years from going into long boring monolouges. I can stop myself for the most part now from doing so, despite a burning desire to continue on.
For me this once manifested itself during a book report I was giving back in april 1990. I spent about 5 minutes talking about what happened in one paragraph, going into extreme detail, making refrences to other parts of the book, getting the whole class to point of snickering loudly to each other and my teacher very impatient. Myself, well, I was oblivious to it all until my teacher interuppted me and told me to get on with the report.
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I live my life to prove wrong those who said I couldn't make it in life...