I am always suffering from auction fever. You go into it with a figure in mind and before you know it your swept up in all the excitement.
One sign comes to mind that came up a couple of years ago in my local auction. It was a Cadbury's Landau sign not in great condition but pretty good. Coming into the auction I thought I would go to AU$3,500- 4,000 for it, before I knew it I was having a bid at $5,000. I didn't end up getting it, and then found out that a friend was bidding at the back of the room and he had out bid me. I was a bit annoyed because he mostly buys motoring related signs, so I wasn't even thinking that he was going to be my competition. Looking back I'm glad I didn't get it because I think our auction fever pushed the price a bit over what it's worth.
Gordo