Cloudy, sounds like your co-worker needs a good slap.
A better way would be to remove a wheel off her chair (I'm guessing that you have swivel chairs [img]tongue.gif[/img] ) and prop the chair up with a scrunched up piece of paper. When she goes to sit down, the paper gives, as does the chair. Hilarious results follow [img]graemlins/thumbsup.gif[/img] [img]tongue.gif[/img]