Urkel meets Uncle Jesse.

Tim Allen meets Tim Allen.

Here are some TV crossovers you may have missed.

Abed Nadir (Danny Audi) cameos on Cougar Town.

Fans of ABCsAbbott Elementarywere thrilled to hear that a season 4 episode will feature a crossover event.

Some of these crossovers are old enough that even your parents might not remember them!

No joke symbolized the series brilliant self-referential fixation like Abeds cameo inCougar Town.

If any show could give it a run in the corny department, though, it would beFamily Matters.

In a fun and extremely cheesy crossover event on ABCs T.G.I.F.

lineup, Steve Urkel (Jaleel White) fromFamily Mattersinvades the lives of the Tanner family onFull House.

Empty Nesteventually turned into a venerable and underrated classic once freed from the constraints of its terrible pilot.

Superman Surprises The Ricardos

Not many TV fans today are old enough to remember watchingI Love Lucyweekly.

Reeves played the worlds most famous hero throughout the 1950s inThe Adventures of Supermanand reprised his role here.

Mike Baxter is more grouchy than Tim Taylor, but he still knows his way around a sports car.

Allen used a final season episode ofLast Man Standingto inundate the small screen with two different versions of himself.