Not a joke because it is intentional but I always found ssh's answer to an non-existent user hilarious: ssh user@host You don't exist, go away! Raw ma

Not a joke because it is intentional but I always found ssh's answer to an non-existent user hilarious: ssh user@host You don't exist, go away! Raw material for further jokes: head -c4 AnyJava.class | xxd -p cafebabe The more morbidly inclined AIX user might try this with tail on a coredump and will find deadbeef.