Another great put down line, used by a woman fending off the advances of an aggressive male:
''If you make love to me, and I find out about it....''
Others that come to mind to describe dim people:
- 3 bricks short of a load
- lights are on but nobody's home
- his/her driveway doesn't come all the way to the house
- 2 bars short of a samba
- ''Do you have enough fuel to land?''
- Takes him/her an hour and a half to watch ''60 Minutes''
(I'll stop here...)