for sale: one dignity, going cheap

Anybody ever been suckered into going to one of those time share presentations?

I got a call the other day about how I have "won" a holiday and all I have to do is view a 90-minute presentation. I know they're going to try and sell me something, but it might be worth it if I get a cheap weekend away out of it.

So anybody done this before? How much of a pain is it to sit through the presentation? (tetsab, I seem to recall that your mother put you through something like this once.)