Snowed In For Christmas!

Betty White makes merriment mandatory, Scott Baio orchestrates Christmas a la The Shining, and from a relentless snowstorm "Balki Clause" is born.... This week's trope is getting snowed in for Christmas!
Here's what we're watching:

• The Mary Tyler Moore Show S5 E9 "Not a Christmas Story"
• Perfect Strangers S2 E11 "A Christmas Story"
• Charles in Charge S3 E1 "Yule Laff"
• Roseanne S5 E12 "No Place Like Home for the Holidays"