[BasDirks]

  Error handling
  
  If your program has a runtime error or a compiletime error the interpreter
  will print "Parenthesis Mismatch" to standard output and then exit.

Priceless. The sad thing is that most "modern" programming language offer basically identical erro reporting.

[emillon]

A friend of mine in a compiler writing class produced a compiler with one error message ‘you lied to me when you told me this was a program’. —Pete Fenelon