Personally, I would have loved to see an ending where the Real Max fell from the sky, and somehow managed to survive. It would have made more sense than the past Max ending, at least.
Sam: Holy (insert-extremely-sam-exclamation)! Max! You're alive!
Max: Yeah, looks like my body isn't affected by fall impact too much.
Sam: God bless your strange Lagomorph bone structure.
Now, how about you guys make up some endings and some dialogue along with 'em?
(yeah, I know my dialogue isn't too great. I'm not the best comedy writer.)