As we mark the 20th anniversary of the Friends premiere, three of the stars of the hugely popular NBC comedy joined Jimmy Kimmel for a skit on his ABC late-night show tonight.  They reprised their roles, with Kimmel as another friend, in a fan-fiction scene played out in Monica’s kitchen from the show. Earlier today, Friends producer Warner Bros. TV announced its 20th anniversary initiative —  a pop-up replica of the series’ signature Central Perk coffee shop, which will be serving free cups of Eight O’ Clock Coffee in Manhattan’s SoHo neighborhood from September 17 through October 18.