Brentford midfielder Jonathan Douglas has been on the wrong side of a giant killing and on Sunday he will be out to balance the books.
The 31-year-old, who signed a new two-year contract with the Bees yesterday keeping him at the club until 2015, was in the Leeds United side that lost 1-0 to non-League Histon in the FA Cup in 2008.
Douglas's League One promotion chasers host European champions Chelsea in the FA Cup fourth round tomorrow and the former Swindon Town man is out to make sure the boot is on the other foot this time.
"Histon were massive underdogs and they did a job on us," he said.
"What I can take from that game is that the impossible can happen. It doesn't matter how big the club is you are playing against.
"We have our own ambitions and we want to win the game. We are not going in to the game thinking that if we lose, who cares?
"We are professional footballers and want to do the best we can."
Brentford are currently third in the table and are six points adrift of league leaders Tranmere Rovers, who they lost to last weekend before Tuesday night's 2-2 draw with Leyton Orient.
And Douglas insisted that whatever happens on Sunday, promotion remains the priority.
"We've worked hard over the last six months to put ourselves in a good position," he added.
"We haven't been in this sort of position at this time of the season for the past couple of years and we have to build on the opportunity.
"This is the most important part of the season for us and the Chelsea game is a nice bonus game."