According to Ronan McGreevy of The Irish Times, actor Charlie Sheen made a surprise appearance on March 3 to introduce his friend Slash before a concert at the Olympia Theatre in Dublin, Ireland.

Sheen joked that he was appearing on stage in Dublin for three reasons. "I want to remind Colin Farrell that I'm still alive," he said. The second reason was to "drink the finest Guinness which our ancestors gave to us." (Sheen has an Irish grandmother.) And the third reason was to introduce Slash, whom he described as the "greatest guitarist in the history of sound."

Slash dedicated the GUNS N' ROSES song "Rocket Queen" to his "old friend" who had flown from Los Angeles for the concert.

Sheen, a neighbor and personal friend of Slash's who called himself a "Rock Star From Mars" when he underwent a public meltdown amid his firing from the CBS show "Two And A Half Men", spoke at Slash's Hollywood Walk Of Fame induction ceremony in July 2012. He said, "It's quite fitting that Slash is getting a star on the very street Axl Rose will one day be sleeping on."

He added, "This star is going to be stepped on more than the coke we did in the '80s."

In an interview with Australia's long-running rock station Triple M during his tour with the Soundwave rock festival in March 2011, Slash spoke about the troubles Sheen was facing at the time.

"I love Charlie," Slash smiled. "Charlie is probably the most rock 'n' roll character in entertainment today. All things considered, he's been having a little bit of a hard time recently with all the bad press and everything. But he's been managing to get away with what he's been doing on that show and get a raise over the last more than ten years. I think that's pretty cool," he laughed.