A boy is standing on the side of the road in an expensive part of town, 
hitch-hiking. A man pulls up in his car, opens the window and asks, "Are
you Labor or a Liberal?" The boy answers "Labor" and the man speeds
away. Another man pulls up and asks the same question. The boy gives the
same answer, and the man pulls away.

 A pretty girl pulls up in a convertible and asks the same question. 
The boy, now infinitely wiser, responds with "Liberal". So, the pretty 
girl tells the boy to get in.  They're driving for a while, and the 
wind starts blowing the skirt up the girl's leg. This arouses the boy 
and he blurts out "Stop the car, I can't take it anymore. I've only 
been a Liberal for ten minutes, and already I feel like screwing 
somebody!!!!"