This listicle might be a moot point what with that perpetual cameo show called 30 Rock, but Best Week Ever chronicles some historic (and obscure) moments in TV comedy crossover synergy with its listicle of The Top 10 Sitcom Cameos Made by Other Sitcom Characters. It’s the formula every rap artist still uses to get on the radio: bring someone popular from a more successful venture into yours, thereby increasing its chances of success. For instance, here are Samantha and Darren from Bewitched popping in on The Flinstones:

Not bad, right?

Seinfeld’s Kramer on Mad About You

<insert inappropriate heckling joke here>