The Liverpool legend's unrelenting attacks on Manchester United favourite Gary Neville are worth signing up for alone, but Carragher has made a habit of taking on all comers since he dipped his toe into the water nearly three years ago.
Hardly a day goes by without Carragher putting someone or other in their place, and the Reds icon was at it again on when Keys tried to take the former Reds star to ask over labelling Arsenal's players as "cowards" on Monday Night Football.
After hearing Carragher's no-punches-pulled view of Arsenal's under-performing players after their miserable 3-0 defeat to Crystal Palace on Monday night, Keys was moved to wade in.
It didn't work out well for the ex-Sky Sports man, who was quickly reminded of his departure from the broadcasting giants - where Carragher is now employed.
So with Keys the latest in a long line of victims to Carragher's lacerating tweets, we've taken a look back at who else has felt the force of the Bootle-native's digital dingers.
The Manchester United legend deserves his own wing in this Hall of Shame.
Hardly a week goes by where Carragher doesn't take aim at his Monday Night Football colleague.
There was the dig at Neville's mirror selfie , after he got a haircut.
Moussa Sow's stunning overhead for Fenerbahce against United last year also had Carragher quickly reaching for the keyboard .
And Neville's stint as Valencia coach didn't work out last season, and of course Carra has used that as a stick to beat his colleague with .
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Not even Carragher's great mate and long-time Liverpool teammate Gerrard is safe!
Ahead of the Liverpool Legends' meeting with Real Madrid last month, Gerrard sat down with Reds sponsors Nivea to discuss grooming habits and who was the most vain during his time at the club.
And while Gerrard admitted his close pal was never one for overly grooming, he claimed that Carragher had changed since he moved into his role as a TV pundit with Sky Sports.
"Who was the most vain? John Arne Riise, but I've noticed Carragher has started wearing wax in his hair, so maybe him!
"[Least vain] used to be Carra but since he's moved into the showbiz world I've noticed he's taken a bit of the greys out of his hair and added a bit of wax to that base of carpet he's wearing, so Carra's taken that over I think."
After hearing about Gerrard's claims, an incredulous Carragher tweeted: "While being interviewed by Nivea!
"And don't start me on that snide beard he grew because his missus liked it".
The Londoners emerged as one the Reds' most fierce rivals following their 2003 takeover by Roman Abramovich, and Carragher has seemingly taken that rivalry with him post-retirement.
The Liverpool legend was ready to take Chelsea on once again last year when they tried to make a joke at his expense as they celebrated the 20-year anniversary of Gianfranco Zola's signing.
Of course, the Bootle-born centre-back had none of it! Carragher responded simply by referencing Luis Garcia's Champions League semi-final winner against the Blues in 2005.
It's not just Gary who Carragher reserves some online digs for, former Everton captain Phil Neville is also the subject of the odd barb.
Back in January Carragher made reference to Neville's time as a United coach under Moyes during the Scot's nine-month stint as Red Devils manager in the 2013-14 campaign.
The former Senegal forward went on an astonishing rant about Carragher and Steven Gerrard last year.
Diouf publicly declared that Carragher was "a s**t" and "a f***ing loser" in a television interview.
Not surprisingly, it was given the short shrift from Carragher, who dismissed the claims of a club-record signing who scored just three Premier League goals.