What does either a specific person in your life, or just the general public do, you just don't understand why they do it, and you either can't ask them or you've tried to ask them and they can't tell you?
Write it here and maybe someone else that also does it can tell you why, or has an idea as to why.
Here are mine:
Why do my neighbours across the street bring their bins outside a full 24hrs early? They are retired, home most of the day, go in and out of their house five or six times during that 24hr period, but bring their bins out early Monday morning when they don't get picked up until Tuesday morning?
Why do people talk on their phones on speakerphone in public, what is the purpose?