How many first year engineering students does it take to change a light bulb?  None. That’s a second year subject. 

How many second year engineering students does it take to change a light bulb? One, but the rest of the class copies the report. 

How many third year engineering students does it take to change a light bulb? “Will this question be in the final examination?” 

How many civil engineers does it take to change a light bulb? Two. One to do it and one to steady the chandelier. 

How many electrical engineers does it take to change a light bulb? None. They simply redefine darkness as the industry standard. 

How many computer engineers does it take to change a light bulb? “Why bother? The socket will be obsolete in six months anyway.” 

How many mechanical engineers does it take to change a light bulb? Five. One to decide which way the bulb ought to turn, one to calculate the force required, one to design a tool with which to turn the bulb, one to design a comfortable – but functional – hand grip, and one to use all this equipment. 

How many nuclear engineers does it take to change a light bulb? Seven. One to install the new bulb and six to figure out what to do with the old one for the next 10,000 years