This Statler & Waldorf requires... backstory!
When I first started the current time-traveling setting for Mage, a couple of people asked if they'd ever see their 'bad' Glimpses or 'bad' versions of characters. It was something I stewed on and decided to run with to make effects of time travel more personal. But, it was something I wanted to work into, and pushed back after people had adjusted to the setting/concept.
Eventually I latched onto the idea of using Star. Yumyumcrow told me it was a bit egocentric but I decided to stick with it so that I wasn't forcing alterations or narrations on someone else's PC. It also worked out nicely with an concept-phase idea I'd had about a previous Seer NPC that Star resembled.
First, I had to figure out how to introduce a younger version in an innocuous way. The entire 449 plot was created because I needed something circa 1997-2000 in Florida, so they could encounter a younger version of Star. So I researched... and researched... and finally dug up Andrew Cunanan.
And so we began.
All I needed was a nudge. A little bump in the timeline of an innocuous NPC I threw in with other, more important NPCs. What I got? PCs that cared. One in particular that cared too much.
And so months of planning, a page of notes, and a couple of weeks worth of scene-setting for future plot was wiped out in a beautiful, wonderful way. Probably doesn't mean that much to those that haven't followed Avis and Star, but pretty amazing for me at ground zero. Because a lot of these words? Are exactly who Star is.
It maybe even, years after the fact, give IC context to my OOC-for-the-lulz idea to see if Happy-Derpy and Angry-Impulsive could be a good fit.
Some games tell Stories through narration->reaction. This, however sideways it went planning/plot-wise, shows just how amazing true collaboration can be. When PCs can write the Story, with all their quirks and unexpected actions, sometimes they'll do something you never dreamed of and which is far, far better than what you had.