parents, they can be an instructors worst nightmare, for the most part they usually have their children there to honestly learn an art and are usually very understanding and eager to learn and help out as much as possible themselves, but I've also seen both extremes of the spectrum with parents, one is the parent who is overly competitive and thinks his/her child is and must always be the greatest competiter, athlete,etc.. and just cant understand if you say the child is doing any wrong whatsoever,any wrong is always from bad instruction. and there is always nothing wrong with their childs attitude. and then theres the other end of the spectrum, the parent who only thinks of the dojo as a baby sitting service, somewhere they can drop their child off for an hour or so every day, whether the child wants to be there or not, I've seen some children with no desire at all in being there in which case this is just as harmful as the previous ex,..in that it takes up time and attention that could and should be given to the ones who are there to learn.