This is dedicated to a friend that really pushed me to post since it's been a while. Here goes:
I watched a video some time ago
A video of a lecturer asking his students
How much does a cup of water weigh when you hold it?
And the students gave answers
Various measurements
The lecturer told them that they were all wrong
He made them realize that
A cup of water doesn’t have much weight when you hold
it
The weight increases simultaneously at the time goes