Do you think, what I think you’re thinking?

In Germany, it is quite seldom to see signboards with English words written on it unless at some tourist attractions. Imagine the disbelief on my face, when I heard that T told me that he came across this signboard below at one of the many floors of his office building.
Uhmm..clearly this sign is not intended for Germans? Because if it is so, it will surely be written in German. And there are some Chinese working there too….I wonder…