What? How? The post is saying to travel to an alternate universe and steal the thing from themselves, I'm saying that Dr Doof didn't steal it. He was given it by his alternate self.

He decided to take it down because it disturbed his simple life too much.

Yeah, but that is true for everybody and their alternate selves. That's why it is called an alternate universe, because there are alterations.

Awww! She's so adorable! Thanks so much! :)

But Doof still gave it willingly to 2nd Dimension Doof.

But then if it fell over the pop cans would fall all over the stairs instead of just at the bottom of the stairs.