"CHANDLER AND MONICA! Oh, my eyes! MY EYES!" With these words yelled out in anguish and pain begins one of the funniest episodes of the series.
While looking at Ugly Naked Guy's apartment with Ross, Phoebe sees Monica and Chandler doing "it". Rachel fills her in and Joey is glad because now everything can be out in the open. But things are never that simple.
Most of the humor doesn't really start until Phoebe devises messing with Monica and Chandler. Rachel and Phoebe have all kinds of fun at the new couple's expense. But once "they know they know", the rivalry is non-stop hilarious.
The highlight of the episode is Phoebe. While she has always had a quirky humor, this is one of the few times she drives the comedy herself. Her in full on flirting mode is her absolute funniest. And when Chandler joins in, the two of them playing off of each other is priceless.
This episode ends with Ross finding out about Monica and Chandler the same way Phoebe did. It marks the last appearance of Ugly Naked Guy on the series, and also introduces Huggsy, Joey's stuffed penguin. This episode is important storywise and flat out funny, and an instant classic for the series.