I think it's from seas.3 "Tempus anyone?", but I'm not sure I recall all the quote...hem, let's give it a try:
"Clark: I'm sorry, I just, I just --- -- bit of trouble believing all of this.
Lois: What? That Tempus is a bandit? That he's H.G Wells? Or that we're from a parallel Metropolis?
Clark: No, that this other me flies around in
tights.
Lois: Your mother made them for you."
...How bad am I?
Carole