What is that dot there?
In a review meeting with top management, jack showcases the cool charts that have been created by him and other data scientists. A senior leader, who was sleeping until then, wakes up and to prove is wakefulness, very seriously asks, "What's that dot there ? "
Jack (while cleaning the screen) : That's just dust on the display screen
Everyone except this senior leader laugh and then
Senior leader (everyone is watching him) : Oh, so finally we have clean data
Everyone laugh including senior leader