11 Things You Totally Missed In Friends
8. Phoebe's Triplets
The whole plot line of Phoebe being a surrogate mother for Frank and Alice gave us some wonderful moments, starting with The One with the Embryos (somewhere in the top 1 of all-time Friends episodes), and ending with the memorable "Chandler's a girl!" line, as well as some emotional beats as well, like when she finally has to 'give up' the babies. However, while it made for some excellent storytelling, there was a rather more practical reason for it.
Lisa Kudrow was actually pregnant at the time, and the producers decided to write that pregnancy into the show. Only instead of having Phoebe fall pregnant with a child of her own, they decided to make it so she was carrying her brother's babies instead. This no doubt made it a lot easier to film the ongoing pregnancy, as it was actually happening, and presumably made acting pregnant a lot easier for Kudrow, who wasn't actually having to pretend.