He saw the first sonogram of his baby.His supposedly dead Nana came back to life.He hates the sight of blood.
From The One Where Nana Dies Twice
"She's not passed, she's... present!"
He found out Phoebe mugged him when they were kids.He found out Joey is in love with Rachel.He found out that his ex-wife Emily got remarried.
From The One With The Mugging
Poor Science Boy.
Phoebe doesn't believe in evolution.Rachel went on a date with Mark.A co-worker ate his sandwich.
From The One With Ross's Sandwich
Not the moist-maker!!!!
The stripper from his bachelor party stole his engagement ring.Chandler and Joey went to a Knicks game without Ross.Rachel entered Emma in a baby pageant.
From The One With The Worst Best Man
Fun fact: It turns out it wasn't the stripper at all. The duck ate it!
THEY WERE ON A BREAK!Phoebe spilled wine on his apothecary table.Moisturizer spilled all over the stuff in his suitcase.
From The One After The Kiss
"Why do bad things happen to good people?!"
He is jealous of Rachel's friendship with Mark, her co-worker.Rachel wrote him a letter, asking him to take full responsibility for their breakup.Rachel said that Paolo was more exciting in bed.
From The One With the Jellyfish
"You had rambled on for 18 pages...FRONT AND BACK!"
He saw Monica and Chandler having sex.Rachel locked him out after a fight.Monica locked him out for being late to Thanksgiving.
From The One With The Girl Who Hits Joey
"I saw what you were doing to my sister, now get out here!"
She lost his pet monkey, Marcel.She accidentally knocked his son Ben's head into the wall.He thinks she's cheating on him with Mark.
From The One Where the Monkey Gets Away
"I shouldn't have let you start out with a monkey. I should have started off with, like, a pen or a pencil."
He found out he didn't get tenure.He overheard someone call his dissertation "simpleminded and misguided."He discovered students were getting it on in the library section where his dissertation lives.
From The One With Ross's Library Book
"Meeting someone? Or are you just here to brush up on Merriam's views on evolution?"
He just got fired because of his anger problem.Rachel just told him she's pregnant.Rachel just told him she's moving to Paris.
From The One Where Rachel Tells Ross
"I'm just... I don't know. I don't understand."
Rachel's sister took Emma to get her ears pierced.Chandler has gone missing on his and Monica's wedding day.He thinks Chandler is having an affair.
From The One With Chandler and Monica's Wedding: Part 1
"I think it means he freaked out and left!"
He's getting divorced. Again.Mona pressured him to get more serious in their relationship.What meltdown? HE'S FINE.
From The One Where Ross Is Fine
"Who else is fine?!"