Who wants to present?

The one who will do the presentation next is chose by the previous person. "Call Harris!" Anna shouts after Nick does the presentation. "Are you kidding me? Why is me?" Harris is so surprised, "Don't call me! I just gave you a chocolate before the class." Everyone laughs. Nick pickes Charlie, and after Charlie does the presentation, he pickes Oliver. "I will pick you, Harris." Oliver says before the presentation. "Why did you do that? I thought we were good friends. How can you be so bad to me?" "So how many chocolate will you give Oliver?" asked Anna. "None."