I say 'excrement' instead of 'excellent' quite a bit. And say 'fairy muff'...
My brother, when people speak with that mid-Atlantic, end of sentence question thing, would answer the question, which is quite annoying, but does make one check oneself during conversation.
I like colourful industrial language. I find it amusing why some people get so worked up with the use of words. The word c*nt is naughty but still sends shockwaves through some people which is quite funny really. The use of bad language is best when done occassionally as when you become Gordon Ramsey is just gets boring and loses any shock value.