Why do some things that are so obvious need signs?

why do people put cats in microwave ovens ?

There's no sign telling them not to? I needed to dry my cat very quickly :-)

so I guess she is a quite hot blooded puss now ?

Otherwise toilets will get wet and they just want to save water.. I guess

If there's a sign it's for a reason... probably they could have saved money avoiding to translate that in english

If you have ever watched a distressed woman disentangling her hair from a vaccum toilet, it would clear. Not all toilets are designed for that thick Asian hair.