Pick Cartoons to crossover

What two cartoons from any shows do you wanna see crossover? I have a few, but my number one choice would be Invader Zim/ Courage the Cowardly Dog.

It would be hilarious and weird.

Top five

Ben 10/ Danny Phantom

Gravity Falls/ Rick & Morty

Steven Universe/ Star vs. The Forces of Evil

Teen Titans Go!/ Ultimate Spider-Man (would be aimed at kids, but hey, I'd watch it)

TMNT/Transformers Prime

Ben10/Star Wars

Rick and Morty/Dexter's Lab

King of the Hill / Star Wars Rebels

Spider-Man TAS / Batman TAS

Pretty much anything / TMNT (1987) (Where's Turtles Forever 2?)

Young Justice/Generator Rex.

Teen Titans/Static Shock.

Ben 10/Star Wars.

Fairy Oddparents/Danny Phantom.

Ben10 and Teen Titans

Teen Titans and Batman

Has the same animation style as Son of Batman and Batman vs Robin.

Just saw this video recently and it blew my mind with the possibilities so Gravity Falls/Star vs The Forces of Evil/Steven Universe