The AERonautical engineer was calculating the shear forces on the wing of the aircraft. It was a tedious lengthy process. Suddenly he looked up and gasped "I could swear that was a spear overtaking our aeroplane - how can that be?"! Then, with a snort he woke up and tidied up his calculations which had got all messed up when he'd drifted off to sleep. His colleagues didn't comment - they'd all been through a similar lapse at one time or another.
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