After a long day of careful and deliberate painting, the last thing you want to do is get paint in places it's not supposed to be. This easy trick will ensure that paint doesn't go shooting everywhere when you close the lid.
This video from the Popular Mechanics YouTube channel demonstrates the dangers of closing a paint can. Excess paint can build up in the rim of the paint can, and if you're not careful it can shoot out when you close the lid. It's best to wipe up and remove as much paint from the rim as you can first. Some of the paint might still hang around, however, so you can safely close the lid with a rag, tissue, or paper towel to block the paint projectiles. Don't forget to clean your paint brushes too!
The Right Way to Close a Paint Can [YouTube]