Sharing fun kid computer misconceptions: I used a version of BASIC on my father's accounting computer that had an error message which included the word "ILLEGA

Sharing fun kid computer misconceptions: I used a version of BASIC on my father's accounting computer that had an error message which included the word "ILLEGAL" (I forget what it was, exactly). I always assumed it had something to do with tax laws and the computer warning you not to break them.