... accidental use of alliteration.

There's nothing worse than accidental use of alliteration

I like alliteration, but I think it should be used with care and thought. In Celtic and 17th century poetry we cannot question its use, but everyday use is problematic.  It always seems to me that alliteration somehow or other reduces the seriousness of the implications of written and spoken English, which is okay if that is what you want to do, but not otherwise. An argument for using it is to make the alliterated words memorable. However, using motorway madness seems to mask the reality of people driving too quickly and killing or injuring other people.  Commuter chaos is miserable for people trying to get to and from work. An habitual party pooper is probably someone who could do with some serious psychotherapy, as does a moaning Minnie. Nobody wants to be in the middle of a family feud or a damaging dispute, which might lead one into the depths of despair. Quite obviously, he who laughs last might laugh the longest, but getting the last laugh often requires either quite a lot of good fortune or well-planned deviousness. 

.....incorrect use of a defining clause

Mr Boris Johnson, the Mayor of London recently said in a speech announcing a project to help underachievers in government-funded schools 
“There is nothing worse than seeing pupils full of potential slowly drifting into apathy." 
We can understand from this that it is acceptable for the pupils that are not full of potential to drift into apathy. I don't think he meant this. I think he was just guilty of sloppy grammar. If he wanted to portray himself as the saver of potentially pathetic juvenile souls he should have used the non-defining clause “There is nothing worse than seeing pupils, who are all full of potential, slowly drifting into apathy."  (ps - I don't actually know what drifting into apathy means, but it sounds like something you don't want to happen to young people). Using a non-defining clause in a sentence when speaking is a bit tricky, but the British politician can generally pull it off. However, with right-wing politicians, even when they use simple and compound sentences, it's not always clear what they mean when they talk about publicly-funded education. Most of them, like Boris Johnson, went to private schools, so only have second-hand information about the state system, fed to them by assistants who themselves went to private school.  Still, Boris Johnson is regarded as a jolly decent fellow so lets hope that he can get all those slackers to shape up and learn how to conjugate their verbs.

... making the wrong choice when using singular or plural

Whether or not to make a noun singular or plural is definitely problematic in the English language.  In my previous post, in deference to the Four Tops and for the sake of historical accuracy, the plural of shadow has been used. However, love, as an idea, cannot be counted, so how is it possible for love to have more than one shadow? Similarly, with death. Some people think that we spend our life walking through the valley of the shadow of death. Note that this is only one shadow and we don't know if it is big or small.  Are the roads ahead difficult, or is the road ahead difficult? I am thinking again about love, which can, and frequently does, cast a shadow over everyday existence. One shadow might be bearable, but when it casts many shadows then you are indeed in a very dark place.