Top Ten List Ideas with the Lowest Possibility of Having 10 Items

I have seen many lists that don't even have 10 items. Some of them have a top ten of things which there are less than ten of. So I am going to make a joke list about these.
The Top Ten
1 Top Ten Numbers Between 0 and 5
2 Top Ten Primary Colors

All colors have been discovered and there will not be a new primary color.
And there is only three Primary Colors!

3 Top Ten Legs of a Dog

If someone makes this list, You know we are out of ideas

4 Top Ten Words in This Title
5 Top Ten Grades in Middle School
6 Top Ten Letters in the Word "Letter"

No Explanation needed.

7 Top Ten Mass Extinctions on Earth

There are only 5 Mass Extinctions in history. If this website, and the possibility of accessing it can survive 5 Mass extinctions in the future, this list can have ten items. The only other way for this to happen is if something causes us to rethink history (Not Likely), and proves that there are at least 10 mass extinctions (Very Unlikely).

8 Top Ten Common Holidays in February

The Only ones I can think of are Valentine's day, Groundhog day, and Presidents day...

9 Top Ten Users of TheTopTens Who Have Level 50

No one does right now.

10 Top 10 Current Continents
The Contenders
11 Top Ten Years in the 2000s Where TheTopTens Didn't Exist
12 Top 10 Best Great Khali Matches
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