This is based on opinion. Please don't list it on a work's trope example list.
Tear Jerker / The Santa Clause
The scene where the judge revokes Scott's visitation rights. You can hear Charlie softly crying in the background.
Also Charlie's tearful confession in the sequel that he can never admit to anyone that when all his friends brag about their father's jobs he has to lie despite the fact that his dad has the best job of them all.
Okay, let's face it, any time Eric Lloyd cries it's a Tear Jerker; the guy has got some serious talent.
The scene where Neil hangs Charlie's stocking is touching, especially since they had been fighting right before Scott took off with him.
The scene where Scott gives Charlie the snow globe.
Laura and Neil's stories about when they stopped believing in Santa Claus. All Laura wanted was a "Mystery Date" game, and she sounds so heartbroken when admitting that she never got it. Neil's story is very sad when he admits that he stopped believing in Santa when he was three all because he didn't get an Oscar Meyer weenie whistle.
In the second movie, the scene that gets to the root of Charlie's behavior. He's so jealous that other kids always get to be with their dads and resents having to be a Secret Keeper when his dad has the coolest job ever.
The scene in the first film where Scott is being arrested. Knowing how young they are, one can imagine how it looks to the children.
The look on Scott's face in the third film when he sees what Jack Frost has done after the escape clause has happened. And the elves look very unhappy at having to help the new Santa run his amusement park in the North Pole.