Out of all the Friends plot holes, this one always stood out to me.

There are plenty of other plot holes in this show that are way more blatant and world-breaking, but out of all of them, I always remember this one.
PS: They weren't on a break.
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Sources:
FRIENDS: || Ross First Time With Carol || - Kartik : • FRIENDS: || Ross First...
Monica ross and chandler tell secrets !Full HD - Funclips : • Monica ross and chandl...
Much, Much, Much Later | SpongeBob Time Card #51 - SpongeBob Time Cards : • Much, Much, Much Later...

[@praneilbalike7941]

I mean he did forget he did it

[@ainsire3702]

well i'll be damned. Never noticed that.

[@djanasurkovic4099]

The one that was the strangest to me was at the Chandler's and Monica's wedding. Chandler looks down and notices how small Joey's feets are. It seems that, for so many years of their life together, Chandler never looked down...

[@tonyg7990]

In episode where Rachel tries to stall Ross and Julie from sleeping together he tells Rachel he was only with one woman his whole life

[@CP-yd7lp]

It's not a pothole he said what he said because he misremembered his actual first time