A couple of them come to mind:
'60 Fleer #80 Martin/Grove, uncancelled. Was on vacation, saw it with no bids @ $1000. and placed a snipe. No one else bid and I was floored. It's factory cut and oversized, and one of the few I've ever seen that wasn't hand cut and/or ripped thru with the cancellation notch.
'58 Bell Brand is a small set, just 10 cards. 6 of them are really easy, 2 of them a bit tougher (Podres and Reese) and 2 are very difficult (Cimoli and Snider). Prone to staining and creases due to the distribution method, finding nice ones is virtually impossible. But this Cimoli came up raw and looked nice, I was hoping the scan didn't hide any flaws. It didn't, $588 took it. It's easily the best example I've seen.
