...did I turn off the lights?

Has it occurred to you that something you do very frequently may slip your mind?

eg. Switching off the lights; Locking your car; etc.

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Is it totally possible for a person to do something on a regular basis,

and one day ask himself if he did that thing for that day.

eg. A man left home for work one day and asked himself if he had turned off the lights at home.

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It seems to me that when someone does a particular thing too often, he may not even need to think about it when he does it.

It just seems to be second nature to him already.

So much so that when asked if he has locked the car or turned off the lights, he may not even remember doing so and may even go back to double check.

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What are your opinions?