Inside a mild-mannered toy golf cup, the kind that pop the ball back at you when you sink a putt (and make you go walk for it when you miss), lurks a lethal weapon -- a tiny rail gun just waiting ...

TikTokers are using the "pen in cup" challenge to see where life is going to take them. But in typical TikTok fashion, irony has prevailed, and people aren't exactly using the challenge as it was ...