A Question of Opposite

What's the opposite of "Goodbye" Would your attention on that be grabbed If you took out all the happy Would you be left with sad If there was a magic number Could you count that high If you lost what you do for a living Would that cause you to die These are some of the questions That it is I've got Oh, one more thing if you don't mind Is that the opposite or not With your head stuck in the clouds Do you find it hard to breath If you turned that frown upside down Would a smile intercede If you went out with the Butcher Would the Baker still supply your sweets If you dated the Undertaker Would the afterlife come cheap These are some random questions That I have running loose Wait a minute, here comes another What's the opposite of truth Is there an account on daylight savings I can put interest in from my time Should I have saved more of the day And spent less on the night Could I dilly dally in the stock market And take it out in trade Or buy a balloon in the shape of Johnny and June And watch them float in serenade Just a few of the questions That I like to throw By the way can you tell me What's the opposite of "Hello"