I count the segments that make up the numbers on a digital clock: 1 has two segments, 2 and 3 have five, 4 has four, 5 has five, 6 has six, 7 is three, 8 is seven, 9 and 0 are six. I count all the segments up and they have to be an even number, preferably 10 or 20. Alarm light indicators, AM/PM lights, and the hour/min separator ( : ) are fair game as well. If they add up to 17 (my most hated #), I have to keep watching without blinking until it switches (I don't know why, don't ask :P), then count and hopefully strike an even number. I also have a problem counting angles everywhere for some reason; they also must turn out even.
Theses compulsions are not that bad, but they do get irritating at some points.
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