If you have the debugger with field content change-access, it is possible and quite easy to: 1. Break/change other...
user passwords in development or in production. 2. Change all ABAP program types including standard SAP program/screen without object key or developer key. 3. Change any database content directly. This is quite common to many developer's knowledge. 4. That a new SAP installation is possible to run forever with ALL authorization without installing a license key.
No demonstration will be shown here, but you are strongly advised to BE VERY CAREFUL about giving debugger access to users/developers.