This reminds me of the classic XP login screen bypass by opening the help dialog, then the print dialog, then searching for a file to open for printing, and then executing 'explorer.exe' (I might be misremembering, this is quite a while ago).

I also remember figuring out how to share my USB key as a network drive to other users. Many fun middays were had blasting around in Halo or Soldier of Fortune II with like 10 friends, although less fun was had when our school's sysadmin found some lingering cache files that were owned by my id.