I know I've mentioned this mixup before:

Originally Posted by Deadly Chakram
Originally Posted by VirginiaR
Vatman? - "Hey, look! I have an evil twin!"
rotflol <soda almost comes out of nose>
But what if Clark stops the original Nightfall (per canon) and that leaves Vatman (and Lex Luthor controlling him) to make him stop the second smaller one. Meanwhile, Lois is wondering why Superman is acting all strange and dealing with a partner with no memories. Would Martha and Jonathan show up in Metropolis when they hear that Superman made it back fine? (Being that Vatman is seen around Metropolis)? Lots of interesting complications could arise.

VirginiaR.
"On the long road, take small steps." -- Jor-el, "The Foundling"
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"clearly there is a lack of understanding between those two... he speaks Lunkheadanian and she Stubbornanian" -- chelo.