Yes kids do get odd ideas of fun, so do adults.
If after the fact we ask , why did you do this, no one has any idea, just kind the thing to do at the time.
Ask any one of the people involved and they for the the love of God cannot come up with a reason.
The acts would not have been committed on their own, most likely never thought of by themselves.
Just takes one person to suggest and demand their friends follow them be they kids or adults that want to please the others that end up in dispair for reasons they themselves do not know.