Why Does this worry me?

This is quite a worrying sight that I came back to uni from a few weeks ago... there are some very good reasons for my distress.
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Why would you want to wash your hair or brush your teeth in OUR kitchen
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Why would you brush your teeth with shampoo?
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Why?
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WHY!!!
Also notice the Bean juice on the toaster.... (still there - I name no names - SIMON)