Smallville, Season 3

Lex:
Legend has it this sword was forged in the fires of Mount Fuji. The blade can cut through anything. The Katai never took it into battle. They never had to, till the day the strongest Katai turned on his own. One by one, the Katai fell at his hand. Nothing left to lose, the last of the Katai lunged at the warrior with this sword. The blade cut him clean in two. But when the warrior's armor fell away, the Katai saw he wasn't even human.

[Lex strikes Clark with the sword, shattering it]

Lex:
Just like you, Clark. See, I've always been honest with you. But it turns out you've been lying to me from the first day I laid eyes on you.

Clark:
No, Lex, I can explain!

Lex:
It's too late! The irony is all you had to do was come to me, Clark. I was your friend. I would've protected your secret. I would've protected you. But I couldn't be trusted because I'm a Luthor.

Clark:
No, that's not it!

Lex:
I don't care! I'm going to dedicate myself to ensuring the whole world knows who Clark Kent really is. Life as you know it is over.