Way back in 1980-ish, after the first major story arc of "The New Teen Titans" was over, Wolfman and Perez did something in issue 8 which was more or less unheard of at the time, an issue devoted to the characters in their off duty lives, especially new characters we're not familiar with.
For legality, the cover of that issue.

Episode 8 of Young Justice (which others have noted is more Teen Titans anyway) tries more or less the same thing.
( Can Young Justice pull off the same trick? (Also, HEAVY SPOILER within) )