Over at iMonk's blog, there've been numerous commenters plugging the literalist RCC view (or the Lutheran one, which to me isn't that different) of the LORD's Supper. Citing 1 Corinthians 10:14-23 NASB, one fellow even goes so far as to insinuate that those who don't share that interpretation are committing idolatry.
His comment struck me as an ironic boomerang, because if we take "participation" to mean spiritual, not physical (as per Jesus' words in JOHN 6:63, "It is the spirit that gives life, the flesh is of no avail; the words that I have spoken to you are spirit and life"), then the exhortations of Paul against idolatry could be applied precisely to the literalist practice.
