Seinfeld, Mad About You and Friends are three very beloved NBC sitcoms set in New York. But, wait a minute: Were they actually set in the same universe?! Could it be?

Yes.

And no.

We are seriously stumped after taking a closer look at all the crossovers over the years. (What? It's our dayjob! And we burn easily in summertime!)

We'll walk you through what we know...

All three shows were on at the same time during their runs: Mad About You ran from 1992-1999, Friends from 1994-2004 and Seinfeld from 1989-1998.

Mad About You was definitely set in the "universe" as Friends. Ursula, Phoebe's twin sister who was also played by Lisa Kudrow, was a waitress on Mad About You, working at Riff's, a popular dinner spot.