DC Rebirth Easter Egg in Teen Titans Go!
Who watches the Watchmen?! It turns out it the the Teen Titans do!
The Watchmen smily face is featured in the episode, and the connection to DC Comics' Rebirth is that now Watchmen is canon and a part of the DC comics universe. The Rebirth event saw Batman find the Watchmen smiley face in the Batcave as Doctor Manhattan was revealed or teased to be pulling certain strings in the comics.