JLA/Avengers in 5 panels.

 No Captain America, YOU are a poophead!!!

 The Avenger and Justice League must together face their greatest challenge: Really messed up continuity!

... Well, I suppose universes gets lonely too... 

 Oh crab, NOT AGAIN!

 No one really sure whats going on anymore, so they just hit stuff. That usually works out.

"Comic-book masterpiece." AS IF! They weren't even on the moon!

(Just kidding, it was glorious!!!)