“Wow that’s so crazy that your software is in everything”
Linus: “I wanna hear my cat purr on my lap”

In the old days of the Motorola 6800 microprocessor, there was an instruction code DD.

When this instruction is run the only way to see what it is doing is with an oscilloscope. From the user's point of view the machine halts and defies most attempts to get it restarted. Those persons with indicator lamps on the address bus will see that the processor begins to read all of the memory, sequentially, very quickly. In effect, the address bus turns into a 16 bit counter. However, the processor takes no notice of what it is reading... it just reads.

Other engineers referred to this as the "Halt and Catch Fire" [HCF] instruction, but we remembered the code by calling it the "Drop Dead" instruction.