It is best to state your case in the first and second paragraph while keeping the overall tone of a letter positive and professional. (cover-letter-now.com)
Some readers might find it difficult to engage with the chatty, informal tone of the letters which can occasionally come over as slightly forced. (faith.org.uk)
In the humourless tone of a letter from school that a well - meaning parent might find whilst emptying the washing machine; (whoframedruelfox.com)