As kids, my friends and I would swim all summer in the AZ heat.  Every time I found myself alone in the deep end of the pool I would frantically rush to the shallow end steps to exit what was sure to be certain death by shark.  You see, the “creepy crawly” made an eerie ticking sound that echoed under water, mimicking the dum dum of the Jaws theme song, in my mind.  If you didn’t get out fast enough- even in the middle of the day- surely your friend would return to the pool after grabbing the requisite bottle of Baby Oil and can of Tab cola, only to find you had been swallowed whole by the invisible shark.