Guys,
Here's one for the

category:
About a year ago, I was bidding on an early J-8-8 BB
exhaust manifold with SMOG ports for my Camaro. It was
one of the last pieces I needed. OK, I was the high bidder
and I wanted to up my bid in the last 30 minutes. I tried
to log in with my regular computer and bid again, but I got
that darn "cookies error" eBay is famous for. So, I used
my laptop to log in and I picked the wrong username ( I
have 3 also ) and I bid against myself and uped my own bid
by almost $250. Needless to say, I won the auction, but I
was sick. I immediately contacted the seller and told him
about my stupid mistake and he graciously agreed to sell me
the manifold for my previous bid amount. This saved me
$250 and I learned my lesson. I'm more careful now.
Steve