Explanation of "getting the brain out" joke

[on:]

Hi there, guys!
I'm not a native speaker but I usually understand jokes in Futurama except that one:
"Well, getting the brain out was the easy part, the hard part was getting the brain out."
This phrase was said by the Professor-1 when he was telling how he removed his own brain.
So I didn't get the joke and listen Russian translation. If I translate the translation(sorry for tautology) back to English that would be something like: "Well, getting the brain out was the easy part, the hard part was putting the brain in."
Is that correct meaning of the joke or even the translator get it wrong?

[Reply #1 on:]

The joke was that the Professor repeatedly mentioned the same action twice. As this same action cannot really be the easy as well as the hard part at once, this wrong phrase should hint that the surgery obviously had damaged the Professor's brain. 

[Reply #2 on:]

And made him slightly mad in the process.

[Reply #3 on:]

It's very similar to a joke from How Hermes Requisitioned His Groove Back:



Farnsworth: You can't just waltz into the Central Bureaucracy. It's a tangled web of red tape and regulations. I've never been but a friend of mine went completely mad trying to find the washroom there.

Leela: Then we'll need a guide. Someone who's been there before.

Farnsworth: Oh, I've been there. Lots of times! [Laughs maniacally.]



Basically, the Professor is an amoral, senile mad scientist. I think that's all the brain joke was getting at.

[Reply #4 on:]

Many thanks, now I get it!
It's good that he has brain damage only in parallel universe, cause otherwise It will be more difficult to his team to work with him

[Reply #5 on:]

It's good that he has brain damage only in parallel universe, cause otherwise It will be more difficult to his team to work with him

Uuuuhh... I think it is pretty damaged in Universe A... And the Professor always makes it difficult for the crew...