Through the years, the January transfer window has been the ideal opportunity for teams to fix mistakes from the summer or just to improve the squad going into the new year.
This transfer session continues to become more lavish, and it's only normal that there will be savvy moves that are negated by ones we can now collectively scoff at.
Let's take a look at some of the best and worst January transfer signings and sales.
In January 2013, Alexandre Pato was sold to Corinthians from Milan.
It would have been almost unfathomable to see this deal happen a few years ago when the Brazilian was supposed to be Milan's future legend.
He still hasn't quite hit his best form since joining Corinthians and the move proved to be a good one for Milan.
Inter's signing of Andrea Ranocchia from Bari hasn't turned out to be such a savvy move after all.
Thought to be the next Italian pillar during his days in Southern Italy, Ranocchia is too mistake prone to be trusted on a weekly basis, and it seems that Walter Mazzarri is growing tired of him in a starting role.
In 2000, Christian Vieri became the most expensive signing at the time when Inter purchased him from Lazio for a fee of around €40m.
The striker affectionately known as Bobo went on to score 104 goals in 143 domestic appearances for the Nerazzurri, making him one of the most feared No. 9s in the world.
When Inter signed Giampaolo Pazzini for €13m from Sampdoria, they thought they were getting a new No. 9 who would give them consistent goal tallies in the double figures.
Il Pazzo only managed a measly 16 goals in more than 50 Serie A appearances and was often anonymous for long stretches.
He was relegated to the bench and ultimately sold in a swap exchange with rivals Milan.
After a few inconsistent seasons in England, Milan took their chances and signed Mario Balotelli from Manchester City's bargain bin.
So far, Balotelli has been able to spearhead the Rossoneri and score goals fairly consistently. Once he manages to mature a bit more, he'll prove to be one of the best investments Milan could have made.
Udinese are still counting their fortunes after lulling Liverpool into buying Andrea Dossena.
The left-back lacked pace and was suspect defensively, only once in a while putting in a good cross.
It's incredible to think that he was even an Italian international but never fit in with the English giants and became one of the worst signings in recent memory.
Even though it's unorthodox, let's put a coach on this list.
Finally firing Massimiliano Allegri was one of the best and most overdue moves in quite some time.
Allegri's three-year spell with the Rossoneri came to a close this January after he was replaced by Clarence Seedorf.
The Dutchman looks to revitalize a team that has been dramatically underachieving this calendar year.
Letting go of Philippe Coutinho has been another one of Inter's colossal mistakes in the market.
The Brazilian No. 10 has been sensational at Liverpool and been one of the key pieces in their Premier League rise.
Blessed with plenty of skill and flair, it's a pity that Coutinho was never able to turn it on in Italy.
In the 2011-12 season, Inter signed midfielder Fredy Guarin from Porto.
The Colombian box-to-box terror has a few disciplinary problems but has incredible talent which has now drawn interest from plenty of clubs in Europe.
Considering Inter only splashed a fee of around €11m for the player, it has to be seen as a bargain in this inflated football economy.
Considering how Pablo Osvaldo's career has shaped up, Bologna's decision to loan him out to Espanyol in 2010 was a terrible move.
It's hard to fault Bologna looking back at his statistics with them—three goals in 25 appearances.
Osvaldo went on to score plenty with Espanyol, earning himself a move to Roma and also a call-up to the Italian national team.
The fact that Milan managed to get a player with the skill of Keisuke Honda for free is quite remarkable.
The Japanese international has already scored on his debut against Spezia as a starter and hit the post in Serie A against Sassuolo only minutes after being subbed in.
Looking back a year from now, don't be surprised if this move will be regarded as one of the best and most savvy in quite some time.
Eduardo Vargas never really fit in with Walter Mazzarri's system, so Napoli let go of him and he's been shining in Brazil with Gremio.
On top of that, he has become of the main components of the Chilean national team, helping them secure a spot at the 2014 World Cup.
It's scary to imagine just how well Vargas would do in Rafa Benitez's highly offensive 4-2-3-1 formation.