I can give one example of shared folder madness. When Palm announced new WebOS SDK beta 2.5 years ago, they distributed the sdk via dropbox shared folder among the beta users. The sdk was whooping 500+ MB of size(Linux, Windows, OSX installers were added). Among those users there were some users having free 2GB account. As sdk size were added to their quota, some of them regularly deleted the sdk folder to save space. As the folder was shared, it was also removed for other beta users. Palm regularly had to regularly had to add the folder again. Hilarity ensued :) They even had to put some dummy text file naming "PLEASE DON'T DELETE THESE FILES'.