i know this is probably a mile of of date as many people will be playing the newer zombie games, but me and my friend play der riese as we got sick of playing the newer games, we tried all the different things to do on the level such as the radioes the fly trap and hide and seek, the (drinking of the red liquid) acknowledgement of the noticeboards. we have done this afew times while playing the game.. then.... this one time.... after we'd tried all these different things and went to change our gun, we used the box, and everytime the box closed we could hear samantha's voice and a weird laugh every single time, this has never happened befor can anyone help or explain what it is?????