10 Friends Moments That Were Totally Unscripted
5. Ross Hands Chandler The Lamp
In season five's "The One Where Phoebe Hates PBS," Ross becomes uncontrollably excited after Emily (Helen Baxendale) finally calls him up to sort out their crumbling marriage, frantically handing a lamp of all things to Chandler for the sheer madness of it.
Ross giving Chandler the lamp wasn't written in the script but a totally random ad-lib by David Schwimmer, such that Chandler's bemused reaction when he's left holding it is totally legitimate confusion on Matthew Perry's part.
But Perry, ever the skilled improv comic, has the foresight not to break character and keep hold of the lamp for the rest of the scene, which only makes it that much funnier.