Put about 100 bricks in some particular order in a closed room with an open window. Then send 2 or 3 candidates in the room and close the door.
Leave them alone and come back after 6 hours and then analyze the situation.
- If they are counting the bricks, put them in accounting.
- If they are re-counting them, put them in auditing.
- If they have messed up the whole place with the bricks, put them in engineering.