Crossovers That Should Not Be 27 - three sets of three rules of three... stinkers

[robkelk]

(shrugs) I only know it by name... and at least naming the crossover elements on an image post as a new rule was your idea in the first place

In the "Should Be" thread where the idea is to start discussion, yes, it was my idea. Here, where the idea is to have fun, well...
Looney Tunes and My Neighbor Totoro.