Comment by iaskwhy

It does sound familiar maybe because I'm from Portugal. One day at school, at some physics class about Newton's laws of motion, my colleagues weren't understanding it so I tried to explain them how that would be helpful by using a very stupid example: let's pretend you are at the window of your room, say on the 5th floor, and you want to spit on someone who is walking towards the direction of the window. If you drop some saliva it will reach the floor in x seconds. So how many seconds before should you spit to hit that person on the head if he's y meters away from the position of your window at the ground level? Oh, remeber it's a sunny day with no wind at all.

So there I was with the most stupid example I could think of and what was their reaction? They were absolutely amazed by it and some minutes later I had a correct answer.