Crossovers That Should Not Be 20: One token-Ringu to network them all

[SkyeFire]

Okay, how about this:
I posed with my well-used but lovingly-maintained S&W .44 Magnum, and smirked at my reflection in the mirror.  "So... do you feel lucky, Karrin?"
Murphy gave me her patented "Dresden, you're a dork" look.  "'Dirty Harry Dresden'?  You do recall what happened to all your uncle's partners, right?"
"But Murph!" I protested.  "The one who was smart enough to wear a vest full-time lived.  And you're definitely at least the second-smartest person on this team."
Karrin's expression barely changed.  "Just for that, someone's not getting lucky tonight."
"Awwww, Murph--!"

Explanation:  No sane judge would let "Dirty Harry" Callahan, Harry Dresden's only surviving relative, have custody, so HD still went into the system.  But he eventually inherited his uncle's gear after Callahan died (or vanished) in the 2nd Great San Francisco Fire (which was probably Callahan's fault, at least partly).  Apparently, a love for big Smith revolvers is inheritable.

Bonus round:  Haryy's .44-loving uncle was that infamous Dirty Harry parody, Sledge Hammer ("This is a man who talks to his gun!").