Related:

• How do you tell when you run out of invisible ink?
• Parables of an incarcerated man: If Americans throw rice at weddings, do Chinese throw hot dogs?
  Was Robin Hood's mother know as Mother Hood? How do you know when you run out of invisible ink?...
• When you run out of time you run out of everything.
• Homer: I'll get our letter so wet, the ink will run and no one will be able to read it!
  Bart: Yeah, but don't other people have mail in there?...
• You will never know until you have found out, and when you do find out, you may well wish you had not known.
• Colored invisible ink. -- Polish inventio
• Strategy is when you run out of ammunition but keep firing anyway.
• All ballpoint pens are lost before they run out of ink.
• Intelligence, in diapers, is invisible. And when it matures, out the window it flies.
  We have to pounce on it earlier. -- Stanislaw Lem...