After 700+ replies, the best scenario for Batman defeating Superman is this:
[spoiler]>Batman invites Superman to coffee
>coffee is laced with Kryptonite[/spoiler]
Read some of the arguments in the comments. If you still think Batman would win, you're delusional. I'm sorry.
Also, Kryptonite doesn't immediately drain Superman's powers. It takes time for him to become weak, despite how it is usually portrayed.
Edit: list of Superman's strengths before commenting
[spoiler]Basically, he is Superman with his full potential unlocked.
He once had to perform an operation in space, so he flew back to earth, read every single medical document ever published, memorized it, flew back into space and performed the operation, all within a few seconds.
Yellow (and blue, but that supercharges him) sunlight is the source of his strength. He once bench pressed a planet for days without sunlight.
He once beat the crap out of Batman, and Batman was literally made of Kryptonite.
He sneezed and he moved the Milky Way galaxy.
He can fly from one end of the Milky Way to the other within seconds.
He can move faster than light.
He has nanosecond reaction time. [/spoiler]
Edit: read some of my responses before commenting. Your comment may already have been proven wrong.
Edit: of course, [i]this [/i]thread gets 700+ replies, but when I actually put effort into a thread, maybe 50 if I'm lucky.
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Superman. Isn't. Canon.