.Why is U the jolliest (最快乐) letter

.Why is U the jolliest (最快乐) letter Why is U the jolliest letter? 脑筋急转弯：5.Why is U the jolliest(最快乐)letter?6.How do you feel(触 脑筋急转弯: Why is U the jolliest letter? Why is U the funniest letter?为什么U是最开心的字母 Why is "U" the happiest letter why is the letter B very hot? why is the letter E so important? Why is the letter A like "noon" Why is the letter b like the hot fire? 道英语智力题,why is the letter E so important?what the letter is t Why is the letter "T" like a boat?