The manager of our beloved Games Workshop made this brilliant sign. Actually, he made two of them. They are now decorating the insides of the store's bathroom and I just can't resist to laugh every single time I see it.
But it doesn't end there. No, no, no. In our store we refer to the condition of the bathroom shortly after it was used for a longer duration by someone as "Nurgle'd". This is why there is also a simple sign above the bathroom that states:
If you Nurgle it, you clean it.
If you Slaanesh it, use bleach.
I love my store.