Actually, I've got one related to a big purchase, too. We put an offer in on a house but the seller wanted list price. (This was less than a year before the bubble burst, but obviously we didn't know that at the time.) We didn't want to pay list: the house needed work; it had been sitting on the market for almost a year; we didn't think it was worth asking price (neither did our Realtor); and we just didn't like the fact that they weren't willing to negotiate
at all. We walked away. Our Realtor told us the house had had multiple offers but the sellers refused less than asking because they'd rolled credit card debt into their mortgage. They literally couldn't take less than asking.
Anyway, we put an offer in on another house and it was accepted. We got an inspection for $500 (and the inspector was fantastic!): the house was falling off its foundation; the HVAC was put in all wrong (like, carbon monoxide was leaking into the house, not getting expelled); upstairs plumbing was wonky and leaking (which sellers would have known if people were living there and using it); weird wiring in the kitchen; etc etc etc. We told the sellers "We're out" cuz we couldn't afford the tens of thousands in repairs just to fix the foundation problem. The house was owned by a church and it seemed like they just asked the congregation "does anyone want to help fix up this house?" instead of having a family live in it that got pros to do house repairs as needed/noticed. Well, we walked away and DH and I asked each other "Should we buy a house? Is this a sign?" We decided that we should either buy a house or try to have a baby. We had a baby.
Now it's nine years later (almost ten!) from that house-buying debacle, and DH will still look at me and say "That was the best $500 we ever spent" about that inspection because it really did stop us from a load of stress--and we got DD. Like I said, we didn't know how the market was going to implode, but we also didn't like how sellers were basing the decisions to price their houses. We paid attention to our gut and I'm glad we did.

Oh, that house was in MI. We moved to TX about 3 years later, and there's no way we could have been able to sell it before moving. And now we've moved out of TX (where we rented cuz we were gun-shy still about home-ownership). Now we've got a great house, but I did make a LO about how the idea of owning a home still freaks me out lol.