Back in 1981 or so when I was learning RPG, TI-Basic, and COBOL on a TI-990 minis one of our fellow students forgot a semi-colon in a program he wrote. This cause two problems. First, the lack of a colon caused the program to go into an endless loop. Problem two was the code was sending the results to the printer. Unfortunately, the grad assistant was out on lunch. One full super-case of greenbar went thru the printer, which almost fried itself.