Of all the morons that I've met, and I've met plenty, the most interesting and amusing moron is the oxymoron!
So what is an oxymoron? Some people say that phrases like 'military intelligence' or 'honest politician' are oxymorons (and, I have to admit that these are the ones I really like).
An oxymoron is a figure of speech where one part contradicts or cancels out the other making it, in some ways, an impossible combination. For example, the commonly heard 'pretty ugly' is a great example of an oxymoron if taken literally. Another good one, often found in furniture shops is a 'genuine imitation'. There are lots of them - you can find a good starter list here https://en.wikipedia.org/wiki/List_of_oxymorons where you can see that there are various kinds of oxymora (yes, that's the plural!) ranging from the bland 'detailed summary' to the amusing 'Microsoft Works'.
As I like the ones that Wikipedia have listed as joke oxymora I thought I'd ask you all if you had any good examples - so if you have a good example of a joke oxymoron please send it me and I'll post it up. Don't feel tempted .... please, to send: 'exciting English grammar'