Bound for work one morning my DH (now ex-, may he R.I.P.), went out to the garage with his large mug of hot tea. He placed the mug, temporarily, on the vehicle's roof while he opened the car door. I must tell you that this particular mug had become a keepsake, as it was one of a pair given to us by my DF before he died. Ex-DH very much admired my "Dear Old Dad" (as my father referred to himself -- yes, he was quite a character!), and each morning he would drink his morning tea from the mug, without fail. DDH (now dumb DH) got into his vehicle, backed out of the garage and onto the street. He then proceeded down the road, the mug filled with tea still perched atop the roof of his blue Cadillac Fleetwood 60 Special, until he came to a stop sign. Applying the brakes a bit too abruptly (as male drivers are wont to do), the mug catapulted off the roof before hitting the ground and shattering to pieces. Oblivious to the unfortunate accident, he proceeded on his way. He reached for his tea, but it was not in the cup holder. Cursing his absent-mindedness under his breath, he thought nothing more of it, as he figured that he had left it on the kitchen counter.
Of course, he later realized that his mug was missing and began reflecting on the days' events. DH recalled being honked at that morning by a driver to his left, who was waiting at the stop sign (scene of the catastrophe), as DH had the right-of-way. At the time, DH had muttered a few expletives, wondering why people were always so rude, as he continued through the intersection. It later dawned on him that the driver was only trying to signal to him that something was amiss. (That DH didn't "get it", does not surprise me.)
My point is that as forgetful as DH appears with this tea incident, he never once forgot our son in his vehicle. I really don't know how somebody can do this. But sadly it happens.