For football fans, days like these don't come around too often.Sunday saw the second FA Cup semi-final, the El Clasico, the Old Firm derby while Manchester United and Liverpool were both in Premier League action too.Nevertheless, neutral supporters were still left with a dilemma when 3 o'clock came around as two matches were being played simultaneously.Man United's trip to Burnley was being shown on Sky Sports while Arsenal and Man City were battling it out at Wembley for a spot in the FA Cup final on BT Sport.But while the action was kicking off on the pitch, there was also an interesting battle going on off it.Jamie Carragher has developed a reputation over the last few years for trading a few shots with various famous faces on Twitter and Sunday saw him take aim at a new target.The ex-Liverpool defender was sat in Sky's studio at Anfield to cover the United game and his old side's clash with Crystal Palace later on and - as is a common trend in the modern age - advertised the double bill via his official Twitter account.

Meanwhile, BT Sport presenter Jake Humphrey was on duty at Wembley and saw Carra's tweet as an opportunity to plug his own programme.

Humphrey cheekily tweeted: "And in the cup 😜"

However, it epically backfired when Carragher fired another tweet back to put him firmly in his place.

"Thought Lineker did the big games?" he replied.

Ouch...

It's true, BT tend to roll out Gary Lineker for their biggest matches in the Champions League and FA Cup but after he worked for the BBC the previous day, Humphrey was given the nod to present on this occasion.

Nevertheless, we think it's safe to say Carragher has claimed another Twitter victim and at the time of writing, Humphrey is yet to reply.

Tweet Jamie Carragher at your peril!