My top six most watched (not necessarily the most rewatchable), in no particular order, excluding Xmas movies:
Pulp Fiction
Snatch
Casino
Shrek
The Little Mermaid
The Wizard of Oz
If we put Xmas movies in the there, you'll get Home Alone and National Lampoon's Xmas Vacation in the top three probably. The Santa Clause would probably make the top five as well.