this UPI news item
MOTALA, Sweden -- A Swedish man was awakened Thursday by an open can of pungent fermented herring tossed through his bedroom window by an unknown assailant, The Local said.
Police in Motala were looking into the matter, which didn't hurt anyone but left the victim's home in need of an extensive mid-winter airing out.
The Stockholm newspaper said investigators had an idea who was behind the "herring grenade" attack, which was classified as a property damage crime.
(OK, this photo doesn't show canned herring. I couldn't resist the far of Abba herring pickled with onions.)
Herring grenades - have we tried those in Iraq?