After waving hello to someone.

After putting a finger in your nose.

Before and after eating.

Before or after walking in the hallway.

After coughing into your hand.

After coughing into your elbow.

After watching a movie on the smartboard.

After sneezing into your elbow.

After sneezing into your hands.

After blowing your nose.

After talking to a friend.

After writing on paper.

After using the restroom.

After putting your fingers or hands in your mouth.