I've been at my job for four months now, so I have ample basis to make the following observation. When someone calls the office, there is a 98% chance that a second call will come in immediately after -- or even during -- the first. Calls don't come in singly or in threes, only in pairs. I have no idea how or why this happens.
Believe it or not, I think there are actual mathematical theorems about this. Although I think those involved the more-or-less equivalent problem of why you can wait forever for a bus, and then two will come along in quick succession.
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