"You Done Stomped on My Heart (and You Mashed That Sucker Flat)" is a song by Mason Williams.

And there are actually three songs under the title of "Get Your Tongue Out of My Mouth (Because I'm Kissing You Goodbye)", one by Waylon Jennings, one by John Denver, and one by Ray Stevens.

As for "If You Think You've Reached the Bottom Just Look Down", John Denver mentioned it in concerts throughout his career, but it's not a real song.