The Incident: Flick is dared by his friends to stick his tongue to a frozen flagpole. He does so, and, predictably, gets his tongue stuck.
The Rescue: Ralphie's dad rushes to help, but rather than trying to pull Flick's tongue free, he pours hot water over the pole. This causes Flick to let out a loud yelp of pain and immediately releases his tongue.
The Aftermath: While the scene ends with Flick's tongue freed, it's not clear if he suffers any long-term damage. The film doesn't show any immediate consequences, but the humorous, albeit painful, ordeal becomes a legend among the neighborhood kids.
It's important to note that the scene is meant to be funny and exaggerated. While it's certainly not a good idea to stick your tongue to a frozen metal pole, it's unlikely to cause any serious harm.