My first-love is still algorithm design, so like I say - I tend to spot patterns, sequences, functions...
My OCD comes in to play a lot with clocks. If I have to get up at 6am, for example, I can't set an alarm for 6:00. 5:57, 5:59, 6:01, 6:03 - all acceptable. 6:03 first choice, 5:57 second choice. Nuke food for two-and-a-half minutes? Not gonna happen. 2:33 or 2:27...