"Why are manhole covers round?"
Three sets of eyes stare at you from tilted heads, hands resting on laptop keyboards, waiting for an answer. You pause for a few seconds, trying to remember if the role you applied for was indeed titled "Software Engineer" and not "Sewage Systems Architect".
"To make them easier to fit I guess?"
The eyes look down at laptop screens as the hands type.
"Great. Next, how would you weigh an airplane?"