The 3Arena erupted on Thursday night as a very special guest was brought on stage during a live recording of The Overlap.
Roy Keane, Gary Neville and Jamie Carragher were joined on stage towards the end of the show by legendary defender Paul McGrath, much to the delight of those in attendance.
One person wrote: "I’ve been at football grounds where 60,000 people are celebrating a goal and it comes nowhere near as loud as it was when at The Overlap Kelly Cates introduced Paul McGrath on stage genuinely feared for the 3arena thinking it was going to cave."
READ MORE: Roy Keane has Dublin crowd in fits of laughter with hilarious reply to 'home' question
Another commented: "The Overlap bringing out Paul McGrath nearly had me an emotional wreck. Him and Keane very good together 2 absolute legends."
Someone else said: "Brilliant night at The Overlap in Dublin. Keane box office as usual and great to see Paul McGrath included as a special guest at the end."
One other tweet read: "Paul McGrath walking out on the overlap was f***ing biblical."
McGrath previously described his first encounter with a young Roy Keane as 'frightening'.
The Euro '88 and Italia '90 hero had already been a stalwart with Ireland, but got to see the potential of Keano up close and personal when in action for Aston Villa against Nottingham Forest.
A young Keane was taking English football by storm before his move to Manchester United in 1993, with Brian Clough handing him his debut at 19 back in 1990.
And St Pat's great McGrath labelled Keane's energy and skill 'frightening' upon his first encounter with the Corkman.
"I would have known about Roy from coming up against him at Nottingham Forest [when I was at Aston Villa]," he told SportsJoe.
"Jeez, he was frightening.
"I played against him up at the City Ground, because this lad ran from box to box, and wouldn't stop running.
"But, also, he was a brilliant footballer. He ran with the ball, without the ball, and wherever he was supposed to be going, he just got there."
Keane's meteoric rise through the ranks across the Irish Sea saw him turn quite a few heads due to his early breakthrough, but McGrath and his Ireland teammates were delighted to see him progress into a leader on and off the pitch.
McGrath continued: "He kind of scared a few people, as well, because he was Irish and people [in England] were a bit more wary of him and were wondering, 'Where did he come from?'
"Because the Irish lads were often coming over at a later age and had not gone through the youth systems over there. He appeared and he was absolutely brilliant."
He added: "When he was on a football pitch, doing a 5-a-side or anything like that, he was frightening, because he was that good.
"He'd take the ball from anyone and he'd keep it, right until he was ready to give it to someone else!
"So, we knew all about him and we were thrilled that he was maturing into this kind of leader, as well."
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