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What is your best excuse for not buying a timeshare?

I've always been curious about this. I've been to just one timeshare presentation (when I was in fresh out of college, and I didn't know that my coworker lured me to attend a timeshare presentation). I'm curious to go to another, as 8 years have lapsed since then.

Now, I've been to many car dealerships (because I have been interested in buying a used car), but haven't really been subjected to such high pressure sales tactics--at least not the ones described to me that timeshare people use. For instance, no car sales person has ever said to me "well, you can always gift your car to your heirs when you're done using it" or "buying cars are a great investment instrument!"

I've been to many blogs and websites on timeshares (Tug2.net, saveoneresorts, igougo.com, tripadvisor, stayhereplayhere.com, consumeraffairs.com, complaints.com, bbb.org, to name just a few) to get both sides of the story. I've seen some standard responses (I can't afford it, it's not for me, I don't want to make a decision now, let me ask my wife, I don't have kids) but those are easily answered by most timeshare salespeople. What other excuses have worked for you in the past that are truly ingenious?
Thanks Steph, for your answer!
Actually, I also read somewhere that the salespeople say that you can avoid your yearly maintenance fees by referring *just* 20 people to come and take a tour. I think that is how my coworker got me to go in the first place. She made no mention of a timeshare presentation--she basically had an ad in our work intranet bulletin board of a free vacation. I guess that's how she paid for her maintenance fees, and I guess she also got to keep any of the extra perks, since I wasn't offered any money or tickets after the presentation either! All of that for a 3 day/2 night stay in Charleston, SC.
To NCCMSS: Excellent post! That is one of the sites I've never been to myself. Thanks for the info.