You know you're in for a treat when your favorite TV characters from different shows cross paths. Whether it's to save the life of a patient, a la "Grey's Anatomy" and "Private Practice" (Thurs., Feb. 16, 9 p.m. EST on ABC), or a nice wink and a nod to fans, crossovers usually bring big ratings and big smiles.
Of course, crossovers are always made easier when the shows are spinoffs of one another, like "Buffy the Vampire Slayer" and "Angel," but being on different networks doesn't always put the kibosh on crossover fun. Example? NBC's Detective John Munch of "Law & Order: SVU" (and "Homicide" before that) showing up on Fox's "Arrested Development," and several others.
As "Grey's" and "Private Practice" complete their latest in a long line of Shonda Rhimes crossovers, let's take a walk down memory lane and look at some of the most memorable crossover episodes in TV history. From "Cheers" and "St. Elsewhere" to "Full House" and "Family Matters," these are some of our favorite TV crossovers.
HuffPost Entertainment is your one-stop shop for celebrity news, hilarious late-night bits, industry and awards coverage and more — sent right to your inbox six days a week. Learn more