It is possible for you to put yourself into a situation that you won't be able to get out of. For example, you can change the administrator of a list you own to someone else. If you do this, you will not be able to reclaim the list without help from an administrator. When you make a change, especially a transfer of authority, think about whether you'll be able to undo it. If you really get messed up, you can call the user accounts consultant at x3-1325.