WARNING: This post might cause the intense urge to watch The Powerpuff Girls immediately.
Alright, let's start with an obvious one, that they were in the same class at Dexter from Dexter's Lab.
Source: molliewho.tumblr.com
In one episode, Blossom comes out of a pile of clothes dressed as Cartman from South Park.
Source: reddit.com
Did you ever notice this Jigglypuff watch?
Source: i.imgur.com
Or Blossom's Pikachu stuffed animal?
Source: reddit.com
