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Pig in a Poke (They get conned into buying because "it's a great deal!", find out what they bought sucks), Violin Scam (the scam is specifically targeting people who think they're the ones doing the scamming)
Edited by Scorpion451
Also check out Kansas City Shuffle.
Frequently a Gilligan Cut is involved. "There's no way they are going to convince me to shell out money for this timeshare" ... five minutes later... "Do you want to see pictures of this timeshare I just bought?"
Edited by Daefaroth This signature says something else when you aren't looking at it.
Much as I'd like there to be a trope by this name, it's probably just a variation of Too Good to Be True and its related tropes.
Is there a trope for when a character goes into a situation, often a timeshare presentation or something similar, knowing it is some sort of scam? Yet they are determined to not be outsmarted (but usually are in one way or another). I think this happened in It's Always Sunny, King of Queens, and Rules of Engagement off the top of my head.