...in a very special episode of Smallville.
After meeting with a fixer about digging up or creating dirt to force Jonathan Kent out of the state senate race, Lex is shot and falls into a coma where the spirit of his mother shows him the life he could have if he makes the right choices. In this life, Lex is married to Lana, with a four-year-old son and a daughter on the way. Clark, still friends with Lex, is married to Chloe.
All seems idyllic until Lana hemorrhages after childbirth. Lex's mother tries to tell him this is still the better path, a life filled with love, but Lex is devasted at the prospect of losing Lana, and his father refuses to help.
It's this vision that apparently pushes Lex irreversibly to the dark side. Sound familiar? Actually, it was pretty well staged. I was more bothered by Clark taking a break from super-speedy Toys-for-Tots deliveries to talk a druken Santa off a ledge. The Santa later shows up to help with the deliveries and magically disappears with the gifts.
Chloe: What if he was the real Santa?
Then you've just jumped the shark.