“ClassCastException: You need to stay in the class or caste you were born into. Java will not accept dailits acting as kshatriyas or noblemen pretending to be working class. Note the spelling mistake (of caste) that was introduced in Java 1.0 and has not been corrected for backwards compatability reasons.”
“CloneNotSupportedException: You are a clone. Find the original you, tell him what you want to do and then kill yourself.”
Now, why aren’t these things in textbooks?