We cats are relentlessly, incorrigibly, wonderfully curious.
Originally a positive survival trait used for tracking prey and exploring, our peculiarly intense feline inquisitiveness can now have, in some situations, the opposite value. Every day medling moggies meet untimely ends by being in the wrong place at the wrong time: under cars, under car bonnets, in rubbish bins prior to pickup, fooling with the prop of the grand piano lid, etc. In our focus on the fascination of the moment we can sometimes lose sight of the larger picture.
Like the train coming.