Setting: Town with 1 or more tavern's, meeting places, etc. Target is male Pc.
A Pc is on the make, ie. looking for love. A woman comes in and looks over the place and picks one of the Pc's. She grabs 'em and asks him to come back to his place. They get into a very nice coach. If the Pc asks any questions about the woman's background she'll say that she is a wealthy widow (she is lying!). One into the carriage she becomes all hands. Once home, a nice large mansion, she ignores the servants strange looks and drags Pc up to the bedroom where a night of passion will commence.
The punch line: The lady is really the wife of mayor/prominent community leader/miliary leader/etc who has been cheating on her. She's out to get revenge! The night with the Pc is the method of her choosing!
In the morning the servants, who do their best to ignore the Pc's presence, will come in and straighten up. They will fold the clothes and bring breakfast. In the middle of breakfast the husband will come home. The wife will get out of bed and start throwing their freshly folded clothes all over the bedroom. Mean while, one of the servants will tell the husband that his wife has company! The husband will charge into the bedroom and try to kill the Pc. This will be occurring while the wife is saying to her husband, "Serves you right for cheating on me!", "He was much better than you", "Oh! I never new what I was missing until last night", etc. This causes the husband to go into blind rage causing him to not fight up to this full potential.
Options: The Pc can try to fight if he gets his weapon. Once this occurs the husband will calm down and fight to the best of his ability. If the Pc does kill or wound the husband the wife will attack the Pc. She really still loves the husband (all well as a few other women!) and will try to protect him. At this point the Pc becomes just a tool for her revenge. She does not care what happens to him....
Flee!!!! The husband will chase the Pc into the streets and then stop saying that he'll get revenge!
Either situations can cause a man hunt for the Pc. The city guards will be brought into the situation. If caught, you can toss 'em jail, strip them of $$'s and items, etc. If they flee the town, bring this sub-plot back into play every time they return to the town. Or send mercs. after the Pc's party to bring back the one Pc to "justice".
Have fun with this one. Make 'em pay for fooling around with out thinking too much! 8^).