actions can you think of that are contagious?

Question: What human behaviour/actions can you think of that are contagious!?
Best Answer - Chosen by Asker:

Laughing!.Www@QuestionHome@Com

A smile

When I am out shopping or just taking a walk!.!.!.if I see a person who looks stressed or just having a bad day, I always try to catch their eye and smile and I always get one back!. I really think one smile can brighten a person's day!.Www@QuestionHome@Com

Lying, stealing, cheating

Loving, helping, learningWww@QuestionHome@Com

dying, revolution, sleeping, eating, fanatical eeth flossing pehapsWww@QuestionHome@Com

Yawning!.Www@QuestionHome@Com

YawningWww@QuestionHome@Com

Boiling sprouts!.Www@QuestionHome@Com