In front of the store, black grandfather says to a crowd, "Hey,
  this dude's hysterical! Tell them what you just told me.", as he
  walks into the store with an old white buddy of his. But I felt
  the 'public speaking" pressure building up, and as hard as I
  tried, I couldn't retell a simple two-sentence joke I just made
  up. As the crowd grew irritated with me, I even picked up an
  object to act out the joke. Now the words were coming out, but
  as I was about to tell the punch line, they had all turned away
  and lost all interest. Not a dream, not a nightmare - just in
  the realm of, "Yes, it could happen." :) "