I recall once I switched from sidewalk to street momentarily while eating my local city-bought sandwich to avoid a gaggle of tourists gawking up at a historic building I'd walked past hundreds of times.
A guide spouted off facts and tidbits. None were retained in my mind, except the depiction of my experience vaguely saying "huh" through a mouth full of food as I returned to my day job a block away. Knowing that I'd continue to walk past this building hundreds of times more all the same.