1) Tell her after 8 months of extremely devoted dating that you don't like her in any non-physical sense and that you only decided that this was bad when you started flirting with another girl at an Improv show.
2) Text message saying "I just realized that over the last two weeks I have gradually lost all feeling for you."
3) In Twilight-style obsessive unhealthy relationship, break up on Valentine's Day/Effective First Anniversary (same day) via an email saying that it's all been a lie and that you're both in love with the concept of being in love, not with each other. For bonus points, do this after you've spent a half hour the night before squealing in (ideally non-materialistic) happiness after discovering the extravagant gift the other was planning to give you for Valentine's.
4) After attempting to resist the urge to get into another obsessive relationship, go three days without talking to the person in question and then say "No, we don't," when they say "[Recounting of suicidal feelings, with several examples]. We have a problem."
5) Break up with the other after five hours of extremely heavy petting and *ahem* mouthing, preferably after this has been happening on an at least weekly basis for six months. For full points, one must do this with the following reasoning (which may not be mentioned to the other party). We will assume you are a heterosexual male:
A) I don't think I like her as much as she likes me.
AA) Therefore this relationship must be completely immoral and a black mark on my soul.
B) I know I don't like her enough that I'd want to have my first time with her.
BB) Therefore we must break up because...well, AA. Oh, and it's affecting my schoolwork!
C) I refuse to break up with anyone through any means other than face-to-face conversation.
CC) I therefore must break up with her on a date.
D) I have a Pavlovian response to seeing her that causes my mind to go blank until after my clothes are back on.
DD) Therefore I cannot feasibly break up with her until after one of our traditional five hour sessions of heavy petting and *ahem* mouthing.
6) Forget they exist for a full six weeks. For bonus points, this relationship must with someone from a different school, living at least 45 minutes away from you, who isn't sure if they like you and can't communicate very well in any fashion other than face-to-face; thus, when finals roll around, you will completely forget they exist until one of your friends asks you when you last kissed a member of the opposite sex and it all comes rushing back.
6*) Redemption points can be earned by frantically explaining what happened and gaining happy closure.
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I'll leave it up to you to determine which of these was executed by me, upon me, by a friend, or upon a friend. If you get them all right, you get a netcookie. Make sure to quote (feel free to snip all the text out for post size) so I know you did it.