You could use a clock, pocketwatch, or even just a watch as a visual aid to teach the scripture "This life is the time to prepare to meet god" (Alma 34:32 or "Watch therefore, for ye know neither the day nor the hour wherein the Son of man cometh" Matthew 25:13.
The first part of the following video shows an example of how one pastor teaches Matthew 25:13 using an enormous pocketwatch:
