if this is in canada you pull over to one side, and don't stop, but slow down enough to let them by.
in the states, get your gun out and shoot the tailgating motherfucker!
"A Chinese Ghost Story"
http://www.amazon.com/exec/obidos/tg/detail/-/6305020876/002-8634975-0684064?v=glance
This is not only obscure and funny it's one of my favorite films of all time. Especially the poorly translated subtitles!