Summer school in International Hall

This summer my hall of residence, International Hall, has become the home of summer school students from the US. Well, I found out that their knowledge of the english language is in some way poor, they don't seem to understand the notices on the wall. Take a look at the following picture and draw your own conclusions! (Click on it to see it bigger).

Well I know now why the DVD room smells so badly every time I visit it!