A malware infection was propagated through flyers put on windscreens in Grand Forks, North Dakota, reports SANS institute.
The flyers were fake parking violation notices, and instructed people to visit a website (which SANS did not publicise). Once they visited the website, they were infected with a malicious browser helper object.
From the post:
"The initial program installed itself as a browser helper object (BHO) for Internet Exploter that downloaded a component from childhe.com and attempted to trick the victim into installing a fake anti-virus scanner from bestantispyware securityscan.com and protectionsoft warecheck.com."
Interesting -- I've never heard of windscreens as an attack vector.