Generate the answer for a given question. The question requires common knowledge of English. Make sure that the answer is in detail, long, consistent with the context, and requires general knowledge of English. To be less repetitive, please vary your language for each question. Give a proper explanation to answer, and if necessary, provide the definition of various terms. And conclude your answer if it's long. If you have used other resources (e.g., Merriam Webster's.) to answer the question, include citations in your answer. You don't need to paraphrase the context of your resources, but make sure that your answer is consistent and complete.

There is a joke: Q: What is grey and comes in quarts? A: An elephant. Why? Why does it come in quarts? What is funny here?.
I feel like I'm walking into some kind of trolling here, but I believe the joke is based around the definition of 'comes' which is synomymous with 'ejaculates'. In other words, the joke is implying that volume of the elephant's ejaculate is rather large: a 'quart' of course being another word for a quarter of a gallon, aka two pints. The first-glance reading of 'comes in quarts' would be 'is available in quarts' (like milk), and the reversal of the understood meaning of 'comes' is where the humour arises (if it does arise).

I've heard meelee, meyley (maylay), and mehlay. Is there any 'correct' way to pronounce it in the U.S.?.
NOAD gives these pronunciations: melee |mala; mala| (also melee) Which are, in order of usage, may-lay, may-lay, and also muh-lay

Sometimes people are referring to mechanical objects as 'she': I love my car. She always gets the best service. Are there any rules when it is appropriate to use 'she' instead of it, and is 'he' ever used in such context?.

The pronoun 'she' is sometimes used to refer to things which can contain people such as countries, ships, or vehicles, or when referring to certain other machines. This, however, is considered a stylistically marked, optional figure of speech. This usage is furthermore in decline and advised against by most journalistic style guides such as the Chicago Manual of Style.[9] If used, the terms she, her, and hers are always used, regardless of the entity's name - for example, 'The U.S.S. John F. Kennedy (CVA-67) was laid down October 22, 1964. She was launched on April 1, 1967...' 'He' in reference to an inanimate object has not, as far as I'm aware, ever been common usage in English.