After all

Have you heard the one about the engineer who met a frog while crossing the road? and do you know how many mechanical engineers it takes to change a lightbulb? Okay, I´ll tell you the answer to the last one: five; one to decide which way the bulb ought to turn, one to calculate the force, one to design a tool with which to turn the bulb, one to design a comfortable yet functional hand grip, and one to use all this equipment.