If you notice more people doing nice things for others this week, there may be a reason for that.
The Greatest International Scavenger Hunt the World Has Ever Seen is happening across the globe.
People can take part on their own, or as a team.
Besides performing good deeds, the hunt donates tens of thousands of dollars to the charity, Random Acts each year.
There are some pretty interesting names for teams, including Fatal Plus, featuring Virginia Tech graduate students.