"SIX DEGREES OF FRANK PEMBLETON: I refer you to this lengthy file. It comprehensively chronicles how 166 different TV shows are apparently taking place in the same universe (that is, inside Timmy Westphal's head, as revealed at the end of 'St. Elsewhere'). Try this one series of connections:Not only does someone have waaaaay too much time on their hands, but I'm starting to worry that I've seen too many of these episodes!
Sports Night on CSC is playing on a TV at the end of an episode of Spin City. Spin City made mention (in Michael J. Fox's final episode) of the existence of Alex P. Keaton, from Family Ties. Andrew Keaton, from Family Ties, showed up on an episode of Parker Lewis Can't Lose. Eddie Haskell (from Leave it To Beaver) showed up on Parker Lewis. Beaver's June Cleaver showed up on an episode of Hi, Honey, I'm Home! Hi Honey, also featured a cameo from Gomer Pyle from Andy Griffith, which was a spinoff of The Danny Thomas Show. Buddy from Dick Van Dyke appeared on Danny Thomas. Alan Brady from Dick Van Dyke narrated a film made by Paul Buchman on Mad About You. Mad About You ties into Friends through Phoebe and her twin Ursula (among other ways). Caroline In The City and Friends crossed over in an episode where Caroline's Annie was hit on by Chandler. Niles and Daphne from Frasier read the Caroline in the City comic strip. Frasier is, of course, tied to Cheers. Westphall, Craig, and Auschlander from St. Elsewhere all visited the Cheers bar.
Thus, every single one of those 15 shows takes place in the same universe, and there are still more connections. Everything from The Geena Davis Show to Becker to The White Shadow can be tied in somehow. The sound you just heard? That's my mind...blowing."
So where's Kevin Bacon in all this?
Homicide: Life on the Street Crossovers & A Multiverse Explored. I found this on A List Of Things Thrown Five Minutes Ago: