Because no one was harder than JT back in 2000.
When bad hair happens to seriously sizzlin' fellas...it's bad. Really, REALLY bad. And no one will forget these hair DON'TS even if the painful styles did occur more than a decade ago...(ah hem, talking to you, Timberlake, Beckham, etc...)
If anything, at least you'll get some good Halloween costume ideas from this — enjoy!