I bought a factory new American Champion 7GCAA during Sun n Fun in 2001. It was the display airplane, so I made arrangements for it to be delivered to me in Orlando after the show. After I took delivery, I discovered I had not noticed that a piece of red trim tape was missing on the inside of the blue "4" on the N number on one side.
The horrors! Fortunately, the manufacturing defect was covered under warranty.
Buying airplanes is absolutely harder than selling them.
We talked to the broker for a week prior to our trip, spent 3+ hours flying to see this POS! We wanted to do a demo flight, of course we would pay for fuel etc. The battery was dead, not a good first impression, the props didn't have nicks, they had gouges!! I wouldn't have flown in it if the battery was good! 


Aside from the left turbo being seized and the logbooks being "reconstructed" it needed about $75K spent on it. Again I passed.
Funny, when I spoke to the owner, he had no idea about the logbooks or really anything to do with the airplane. His pilot was taking care of all of it for him, I think the pilot sold him the airplane as well. 
...Long story short.... 1981.....
My first plane, bought with 1.5 hours in my log book. Saw a 75 Warrior with a for sale banner on the prop... Called the guy, agreed on a price. Turned out the only one flying it was his banker. Same bank in Apopka I banked at.. Called the banker on Monday, he said he would broker it for 200 dollars in house since that bank held the note.. I agreed.. Don ( the banker) said he would change the paperwork and send me a payment booklet ( remember those)...
One month went by and no booklet so I called Don.. He said it was in the works so don't worry. Another month and still no booklet.. Called the bank and the receptionist told me she would pass on the message to Mr Dean... Third month and still NO paperwork or booklet... Back then small town banks actually had owners, managers on site so I went in on my Saturday off and was chatting with the head teller when the head banker /owner /president walked up..
We went into his office, I showed him all my sales documents, receipts, etc etc... The guy turned bright red and called in the head teller, who was the accountant for that bank too.. Told her to bring him all of Don's transaction records for the last 4 months.. He then told me that Mr Dean no longer worked at there. Those two spoke back and forth for a few minutes and concluded that Don had purposely held back on my paperwork /payment booklet to make it look like I defaulted on the loan so he could buy it for the balance due...
The bank pres credited me back my 3 grand deposit that Don was supposed to give the seller, let me pay the 3 months back due payments and left the interest rate for the duration of loan...... Keep in mind, at this time in history, interest rates were out of control and heading to 20+ % for loans...
The banker called the police and filled out a felony fraud report and I hope like heck they caught that crooked banker... Owned the plane for 8 years.. bought it for 12 grand,, flew it for 600 hours, sold it for twice that... I loved that plane,, I HATED that crooked banker... Hope he is rotting in hell..
Or Don found out he was getting canned and took everything he was working on and threw it away to make the bank look bad and lose money.
I was told by a broker that there was a project that I needed to buy when I was looking for a round engine project. It was supposed to be in a hangar, and the owner would know I would be stopping by to look at it. The price was right.
I showed up at the Door and asked If I was at the correct place, Yes we have an old aircraft, is it for sale? yes, we are asking $125,000. (I was told 10k) Can I take a look at it? Sure we can walk over to the hangar.
As we got to the hangar I noted the grass and weeds were not mowed near the door, I ask, how long has the Stinson been in here? they say it has sat for nearly 25 years, It was G/Pa's trophy. he told us what it was worth.
Finally got the hangar door open, It was like walking into a time capsule the tools were lying right where G/pa laid them last. the wings were off and hanging from the rafters, the fuselage was off to the side of the hangar floor covered in cob webs dirt and dust until it was nearly unrecognizable. But sure enough it was an old SR-10 Reliant.
There was no logs, N number, registration, AWC, or any other paper work of any kind.
I simply told them that the project was just too much for me. 6 months later I understand the hangar was demoed, with the Stinson it.


... and am carefully watching the fallout of a guy buying a Grumman-American AA-5 that just emptied its tanks onto my ramp (and has other issues)...and it's not even May yet.