All clocks in my home must be perfectly synced with atomic time. I will sit there and wait until the very last moment before hitting the button to confirm the time on the microwave/stove/wall clock/etc., so that it doesn't change over to the next minute until it's supposed to.

The irony is that the rest of my life is in complete chaos due to having untreated ADHD. Keeping accurate time is the one thing I care about having in order. Thankfully DST doesn't exist where I live so I rarely have to re-sync everything more than once every couple of years or so.