Sometimes if you haven't played the game for a few days, mysterious-sounding music will
play and an orange text box may appear. A certain random event will occur. 
The following is a list of events (a.k.a. "scenarios") that I can remember:

1. ant scenario
2. shooting star
3. the return of Biggles
4. black beans
5. mysterious crate
6. villager with stomach problem
7. wax scenario
8. green pearl
9. villager romance
10. the playful dolphins/ otters

There are many more and the option you choose could determine the fate of the village and
its inhabitants. Some of the bad things that could result in your decision are skill/memory 
loss, death, or a loss of food/ Tech points. Some good things that could happen are skill 
gain, new villagers, more food/Tech Points/resources, and more.