Without language so much humour would be lost. Mainly juvenile humour.
Most of you will already have seen what's coming here, either because you're juvenile or once were. Perhaps you've just seen it and detest defacement.
I was itching to reach for the can of spray paint when I saw this estate agent's sign the other day. You'll see what my efforts would have yielded later.
Why we refer to the toilet as a crapper has been discussed here before and I've found another source which makes for interesting reading as to whether he (Thomas Crapper) invented the toilet. You can find it here:
It's always best to remain cautious about articles we find on the net, but it's clear some research has gone into that one.
So, I wonder how many readers would have done this at one time: