I used to own a multi-meter, which I inherited from my Grandfather sometime back in the early 1990's. It was a nothing fancy, but had a function for quickly measuring the HFE value, which I found very useful.
Said meter died a few months ago. My newer multimeter lacked this function, so I bought a cheap meter on ebay to fill in the gap.
But it is the devil's multimeter. Whenever I turn it on, the display briefly flashes up the number '666' before reading zero. Here's a video....
Nothing is attached, and the number comes up regardless of the function selected.