One year
Things Cut in Half: Digging this twitter account: HalfPics. Above, a hand grenade.
Five years
Random ham radio trollfight audio (explicit): Two trolls on ham radio, one identified as “G-K,” the other as “Robert” or “R-J” overheard accidentally on August 29, 2009, while surfing first responder frequencies during the August 2009 Los Angeles wildfires.
Ten years