One of my favorites is the warning you get if you enter the shell of an Oracle ZFS storage appliance:
+-----------------------------------------------------------------------------+
| You are entering the operating system shell. By confirming this action in |
| the appliance shell you have agreed that THIS ACTION MAY VOID ANY SUPPORT |
| AGREEMENT. If you do not agree to this -- or do not otherwise understand |
| what you are doing -- you should type "exit" at the shell prompt. EVERY |
| COMMAND THAT YOU EXECUTE HERE IS AUDITED, and support personnel may use |
| this audit trail to substantiate invalidating your support contract. The |
| operating system shell is NOT a supported mechanism for managing this |
| appliance, and COMMANDS EXECUTED HERE MAY DO IRREPARABLE HARM. |
| |
| NOTHING SHOULD BE ATTEMPTED HERE BY UNTRAINED SUPPORT PERSONNEL UNDER ANY |
| CIRCUMSTANCES. This appliance is a non-traditional operating system |
| environment, and expertise in a traditional operating system environment |
| in NO WAY constitutes training for supporting this appliance. THOSE WITH |
| EXPERTISE IN OTHER SYSTEMS -- HOWEVER SUPERFICIALLY SIMILAR -- ARE MORE |
| LIKELY TO MISTAKENLY EXECUTE OPERATIONS HERE THAT WILL DO IRREPARABLE |
| HARM. Unless you have been explicitly trained on supporting this |
| appliance via the operating system shell, you should immediately return |
| to the appliance shell. |
| |
| Type "exit" now to return to the appliance shell. |
+-----------------------------------------------------------------------------+
I like how it explicitly says "no, seriously, Mister Unix Wizard, we mean YOU."
