1.21, Tempest

Smallville, Episode 1.21: Chloe and ClarkClark is preparing for the Formal; trying to decide his tie color, get the flowers, and even thinking to borrow a limo from Lex because he "knows" she wants one even though she says she doesn't.  However, Chloe accidentally dashes his good mood when she tells him that the LuthorCorp plant was closed that morning.

Later that day, Clark meets Chloe in the Torch, claiming to have been looking for her; she tells him that she still wants to go to the Spring Formal to "appreciate all the quaint Smallville High customs while [she] can"; it turns out Gabe is talking of moving back to Metropolis permanently.  This doesn't thrill Clark or Chloe at all; Chloe makes Clark promise her that "Saturday is going to be great."  Clark tells her it will "be a night [she'll] never forget."

A few days later, Chloe agrees to drive to the dance after Clark's truck exploded.  He complains that he's lost the "Prince Charming vibe."  Chloe reminds him that "Cinderella was never really [her] role model anyway."*  They both note Whitney's departure while springboards them into a conversation about Chloe's fears that Clark will abandon her at the dance to "confess [his] undying love for Lana."  Clark kisses her in the hallway and tells her that he's going with her because he wants to "not by default."

Smallville, Episode 1.21: Chloe and ClarkChloe picks Clark up for the dance where she notices Clark didn't pick the red tie - he claims that "instinct told [him] it was the wrong way to go."  When they get to the dance, it has already started raining.  They get compliments from their friends; Chloe takes Pete's picture while Clark waves Whitney goodbye.  

Superman's Girlfriend: Lois Lane #048, Book Two: coverAt the dance, Clark requests one of Chloe's favorite songs for her.  She remarks that Clark is a man of mystery - "Every time I think I've got you figured out, you surprise me."  Clark notes that he's still there and they have the now infamous almost-kiss.  When Clark realizes Lana's in possible danger, he runs off without a second thought leaving Chloe to look for him in the crowd.

*Notable - this is the first of many Cinderella shout-outs; interesting also that in 'Superman for All Seasons' Lois makes a comment about giving up on fairy tales, and in the Silver Age comics, Lois was actually turned into Cinderella.  In Superman: The Movie, Lois also makes comments about Cinderella.