These men are beating each other senseless using fluorescent tube light bulbs as weapons. This is apparently a sport in Japan. I can't find much information about it online, so I take it that it is not a widely popular sport. One blogger said "It's like WWF meets WTF." -- which seems like a good summation. There are more pictures at the link. Content warning: graphic violence.
Link via Geekologie | Image: Blue Circlet
ND, the exit to the internet is the second door to the left.
Indeedy do. Perhaps their brains are already sub-par so the extra damage is minimal.
This is serious stuff.
http://www.epa.gov/mercury/spills/#fluorescent
http://www.atsdr.cdc.gov/toxprofiles/tp46.html