In celebration of the premier of Friends which happen 20 years ago Warner Bros has opened up a Central Perk Pop-Up Coffee Shop that the characters frequently visited. The pop-up shop wiil feature Friends memorabilia, including signed scripts and cast photos capturing behind-the-scenes moments from the set and candid shots of Chandler, Joey, Rachel, Monica, Phoebe and Ross goofing off. The Central Perk Pop-Up Coffee Shop is located at 199…