text: Heed BoredLawyer.  (Why is he bored???)\n\nYou can always reword a sentence you find difficult: "On Mary's and my behalf"; "On Mary's behalf and mine", etc.  Usually it's a good rule to discard "myself" - it can sound pompous and unnecessary.  A lot of other people have a good rule to work by: take out the other person and see how it sounds:"John took a picture of Mary and I" is incorrect when you say: "John took a picture of I".  And you don't need the "myself" - "John took a picture of Mary and myself" should be simply: "John took a picture of Mary and me".  "Myself" works in, for example, "John thinks roses are lovely; Mary does not.  I, myself, think they are all right".\n\nGrammar does not change in the English-speaking world, whereas slang and colloquialisms do.  It would be silly to announce yourself correctly saying:"It is I!"  Therefore the incorrect "It's me!" will be quite acceptable!\n\nA lot of people have trouble with the cringingly awful "Between you and I" - no!  It's "Between you and me"!  I have even seen, in a fairly reputable publication:"Me and him went to the shops..."\n  \nSo, me is/am signing off now...