WHAT have Winnie the Pooh and Catherine the Great got in common?

I just remembered, after many years, what is still my favourite joke of all time. 

WHAT have Winnie the Pooh and Catherine the Great got in common?

The same middle name.

The second funniest joke is:

How many surrealist painters does it take to change a light bulb?

 Fish.

Just one more ancient, early 80s, lightbulb joke:

How many psychologists does it take to change a lightbulb?

Only one, but the lightbulb has to want to be changed