They say what happens in Vegas, stays in Vegas. It’s a great time to let loose and maybe throw on that sexy thong underwear for a night out. However, at Rock in Rio USA, that person wearing the thong wasn’t an office drone cutting loose for the weekend or an aspiring stripper, but Metallica’s Lars Ulrich, who sported a whale tail while playing this past weekend.

Maybe it was an eye candy for all the ladies attending for Mother’s day, hence the flaming hot red choice of color or just that Lars thinks it looks good on him but whatever reason was, it is definitely The Thong That Should Not Be and the mental scars I got will ensure a long-lasting trauma and no matter how many years pass and therapy, the Memory Remains.

[Metalsucks, via WEBN]