Kids always like to copy others. If one kid touch any toy from a bowl, all will like to have it. No mater what other toys left. All will believe that their life is depending on that particular toy. In school if one kid start wearing sunglasses, then rest of the student will start follow that kid. And then all other parent have to buy sunglasses for their kid too.
That's why please don't give/bring anything extra ordinary to your kid in school. Because then others might like to have that. It's not a good situation for parents. If I don't give that new thing to my son, he will stay upset, will try to have it from that kid by forcing, if fail may keep looking at it. It's not a pleasant situation.