hey all, i was wondering if you could all offer me some suggestions.

I finished my lecture on monday morning and sat around with some people discussing an assignment. Someone found an overhead transparency that read "Please fill up seats from the front". I decided it would be interesting to put it up and see what the students coming in from the next lecture would do. There was generally a lot of standing around with stupid looks on faces. Generally after a lot of milling about they would go and sit down normally.

Next week im planning to put something up that will totally mess with them. i was wondering what thoughts you all had on what i should put? I was thinking of something really trippy and paradoxical that will actually force a reaction.

Have fun and be creative, its all in the name of science!