Tray

I have an uncle who was once reprimanded his servant for not bringing the glass of water in a tray. He taught him that whenever you are asked for a thing bring it in tray.
After a week or so my uncle asked the servant to bring his shoes, and the servant brough them in tray :)

The Egg

The interview at ISSB (Inter services selection board) is pretty more pyschological where they check the candidate's mental capabilities.
Once the interviewer placed an egg under a cup and asked the candidate to pick it up without touching the mug. The candidate smilingly said 'How do i know that if there's an egg in there or not'
The interviewer picked up the mug and said 'Look its here'
The candidate picked up the egg and said 'Look i did it' :)

Efficiency

During an interview in the ISSB which was going on the third floor of the building, a candidate was asked to jump from the window. *You cannot deny a senior's order in army.
The candidate rose up, went to window, climbed, turned around and jumped inside the room :)