Happy Holidays!

What does the NEC say about running a circuit from a single breaker to
"unrelated" locations of a house?

For example, let's say I want to add a receptacle in the 1st floor
family room. Let's say the feed to a 2nd floor bedroom runs along the
basement ceiling right below where I want to add the receptacle. Is
there anything in the NEC that says I can't tap into the 2nd floor
circuit to add an outlet in a 1st floor room?

This is really just a curiosity thing, not something I have a need to
do. I'm just wondering if it's OK to run a circuit from one breaker to
all sorts of different locations in a house.

Thanks!