My son had a project presentation today at school. When he was answering the judge's questions he innocently said something that created a laugh in the audience. After that he got really nervous and was not answering any questions. He is not a shy kid, he has done some very good presentations previously. He seemed to be fine after that but I don't want this to affect him in any way. Should I bring up the subject and talk to him about it or should I let it go and assume that he will be ok? Also should I tell him what created the laugh in the audience or will I make him more nervous?