Three allied pilots are shot down over Nazi Germany... They're captured and forced to stand facing a wall, swaying back and forth saying "tick ... tock ... tick .... tock ..." until they can't take it any more. After the first hour, one pilot can't take it any more and tells them everything he knows. After another hour, the second pilot cracks and tells them everything he knows. At the end of the third hour the remaining pilot decides to do something rebellious and starts saying "tick ... tick... tick...". The interrogator comes up to him and says "you know, we have ways to make you tok"