General   (General discussion, talk about anything.)

Any spies will be found out during our forthcoming Health & Safety lectures.

Whilst extolling the virtues of using multiple post-it notes to prevent fatalities, we shall be observing the audience.

Instead of the usual biros we shall issue some fancy new LD pens.

The assistants (2nd class) will behave normally and try to eat them, but the boffins will pull them apart to study their mechanisms. (springs, screw threads etc) In the process they will lose bits. The assistants will also pick up any pieces of the boffins' pens which go astray and chew them as well.

Here's the clever bit:

Fooled by the "pen ruse" the spies will take care of their pens, in the hope that they are valuable prototypes.

Anyone leaving the lecture room with an unchewed or intact pen is therefore a spy.

Willy Wonka would be proud.