Although every episode of what can only be described as the most legendary TV series ever is funny, these particular episodes tend to leave their viewers in breathless laughter.
"The One With Two Parties" (Season 2, Ep. 22)
Rachel's parents are getting divorced and can't be in the same room as each other, so the gang invites only her mother to Rachel's surprise birthday party. When her father shows up unannounced to visit, they have to spend the whole night hiding the two from each other.
"The One With All the Kissing" (Season 5, Ep. 2)
When Chandler and Monica first start secretly dating, Chandler slips up and kisses affectionately Monica goodbye before work in front of Phoebe and Rachel. Naturally, to cover it up, he has to affectionately kiss each member of the gang every time he leaves the room.
"The One With Ross's Sandwich" (Season 5, Ep. 9)
Aside from Ross's semi-understandable rage, this episode features a slew of embarrassing evidence that Monica and Chandler are knocking boots in secret. They're still not ready to reveal their relationship, so they continuously pin it on their trusty scapegoat, Joey, who is forced to admit to the gang that he took off his underwear in Monica's apartment and has naked photos of her.
"The One In Vegas: Parts 1 & 2" (Season 5, Ep. 23 & 24)
On Monica and Chandlers' one year anniversary, the gang travels to Vegas to visit Joey on the set of his non-existent movie. After purposely embarrassing each other the entire trip, Ross and Rachel drunkenly get hitched and become "Mrs. Ross and Mr. Rachel."
"The One With Unagi" (Season 6, Ep. 17)
Because of Ross's "background" in karate, he lectures Phoebe and Rachel on the importance of being aware of one's surroundings at all times, a concept the Japanese apparently call "unagi." Despite being so extremely misinformed, Ross intensely launches a full-blown battle to prove that the girls wouldn't be able to defend themselves against an unknown attacker, and an amused Rachel and Phoebe play along. There's nothing better than watching Ross go to extreme lengths to win, when he so, so clearly has already lost.
"The One With The Stain" (Season 8, Ep. 7)
Chandler hires a cleaning lady that is surprisingly up to Monica's standards, but Monica believes the cleaning lady is stealing wearing her jeans and her bra. Monica tries to find the identifying ink stain on her pants by sticking her head in between the cleaning lady's legs. Subsequently, she bullies Chandler into checking out the cleaning lady's bra, which ends about as well as you would think it does.
