In our Transfers that shook the club feature, Football Transfer Tavern takes a look at deals that many may not have seen coming and the impact that they had during their time by using statistical data and pundit remarks.

On Wednesday night at Anfield, the first Merseyside derby of the season saw Liverpool romp to a 5-2 win that kept them eight points clear at the top of the Premier League going into this weekend's games.

There have been many Reds players past and present who claim to have been boyhood supporters of neighbours Everton, including Robbie Fowler, Jamie Carragher, Ian Rush and Adam Lallana. [via Daily Star]

One man who directly swapped one Merseyside club for another was Nick Barmby, who crossed Stanley Park in 2000 in a £6m deal and became the first player since Dave Hickson in 1959 to leave Everton for Liverpool, as archived from liverpoolfc.tv.

It was a moment of retribution for the winger and boyhood Reds fan, who nine years previously had an unsuccessful trial at Anfield before his transfer "caused an unprecedented furore on Merseyside", according to liverpoolfc.tv.

Barmby's first Liverpool goal came in a 1-0 UEFA Cup win away to Rapid Bucharest, although it was his next goal which stood out among the eight he scored in a red shirt.

It came with a diving header 12 minutes into the Merseyside derby at Anfield, the first since his crosstown switch and a game in which many of the visiting Everton fans taunted their former winger with chants of 'Judas' (as per lfchistory.net).

Barmby was also involved in the build-up to Emile Heskey's goal in a 3-1 Liverpool victory that day as he got one over on his former club. [via BBC]

The Reds won three trophies in 2000/01 and the England winger scored along the way to those League Cup, FA Cup and UEFA Cup triumphs, netting in the penalty shoot-out in the final of the former, but the following campaign would not be so kind to him.

He made just 12 appearances and didn't score in 2001/02, with an ankle injury ruling him out for most of that season, and was allowed to depart for Leeds in August 2002 in a £2.75m deal (as per Daily Mail).

Barmby's Liverpool career may only have lasted a couple of years but he made his mark during the treble-winning 2000/01 season, not least in the derby against the club that he boldly left to come to Anfield.

Liverpool fans, were you shocked by Barmby's switch from Everton in 2000? Share your thoughts in the comments section below!