I kind of hate you for this one.  I got it right away, and I'm not a psycho, just logical.  I think it's a poor test.  And I'm bitter.

Sweet. I'm not crazy!

Actually, I don't think that's a good test, seeing as I've heard that same question several times before.  It's possible people have heard it before.

Yes I know I have the answer... I won't post it here for other's sake.  I've seen it before, but I still got it the first time in about a half a second.  I still think it goes back to intelligence and logic.  Oh and also I asked a man whom I KNOW is crazy, and he didn't get it.

I also laughed at the 'toss off' thing. Brit slang has a way of making very dirty things out of what sounds normal to Americans.

The simplistic sociopath would posit that Margaret is hoping for a fresh opportunity to reconnect with Bill in a way that enacts the generic fatefulness of their first passionate encounter.  A darker pathos suggests Margaret is friendless and has imprinted her brief erotic encounter with all the hopes and dreams she could have achieved by stepping out of Susan's shadow (the demographic reality of your one and only friend dying is low so we can assume Susan has some degree of popularity).  Sue is the gal standing in the way of Margaret and all of mankind.  In disposing of her foil doppelganger, Margaret believes she has restored balance to the universe and finally collected the love she is due.

That said, I am a kind empathetic lady (a Susan!) without sociopath tendencies.  Although I imagine this is what a raging sociopath would say to cover her scent.  

My dad can never stop snickering when he hears the phrase "on the job training."

As to the question, I think I get the obvious answer because I love those silly logic puzzles ("A train leave Manchester traveling at 56 miles per hour. A second train leave London traveling at 63 miles per hours. How many monkeys does it take to kick all the seeds out of a dill pickle?") But if you asked me, I'd give a surreal answer, like "She found out what Susan did to her goldfish when Margaret was 7." Just cuz I'm annoying like that.

i know guys who use this as part of their game. it's like a long drawn out neg designed to make the girl feel bad and to get her to defend herself to appeal to the player-thus continuing the conversation. took me half an hour to figure out and another half to defend. hey, at least he bought me drinks.

thatasianygirl, I HATE when men do things like that.