They all are patients in a psych ward.
They all are patients in a psych ward.
Next, the friends are deeply suspicious, sometimes even downright hostile, towards those outside of the group.

Friends | IMDb
Ross lost custody of his son for being a crappy dad.
Ben was actually a pretty consistent character on the show for several seasons.
The reason this theory came to be was because of theSeason 4 DVD box cover.

The box shows the six friends sleeping in a bed together, side-by-side.
Every single friends eyes are closedexceptfor Rachels.
Phoebes stepdad killed her mom.
The only information involving his incarceration is that he went right after Phoebes mother passed away.
In one episode, Phoebe says ,My mother was killed by a drug dealer!
Is it possible that this was a slip up?
Its also possible that their stepather told them that their mother had killed herself.
Lying to them so you can protect his image in their eyes.
And, uh, very sad.
Jack Gellar wasnt actually Monicas dad.
This could explain Mrs. Gellars extreme favoritism towards her son and lack of affection for her daughter.
She is projecting the guilt she had about betraying her husband.
Monica is a constant reminder of that mistake.
Phoebe hallucinated the show.
This theory says that Phoebe never stopped living on the streets and was addicted to meth.
This is when Phoebe began fantasizing that she was part of the friend group too.
I mean, thats probably true.
But hey, its interesting to think about at the very least.