Well until the school just called me... Apparently two bullet shell(whatever they are called not bullets just the shell) were in the cup. DH went shooting for his bachelor party two years ago and brought them home.
DS wants to be a FBI agent when he grows up so he is very interested in such things(another reason I wouldn't allow a gun in the house) well anyways he brought them to school to show his friends!!!
The principle was really nice about the whole thing but I'm mortified