Don't buy a car thats built on a Monday or Friday

[Command Prompt]

I remember one of my teachers telling me this story once, and its funny cause sadly its true, I just can't remember the full story behind it. Anyone else heard this one before?

Please don't say CAUSE THATS WHEN PEOPLE ARE ALL LAZY AND SHIT LOLOL, I can figure that much out but there's more to the story than that.