So ein Mist!

He's "gut" to be joking.

Hey, don't you laugh at his balls.

You're right. My mistake. The representation in the pic is the closest one can get to a 3D one. But actual Klein bottles can only exist in 4D space.

It's a Klein bottle; a 3D object with only one side.

And thus math claims another victim. When will we learn?

"Ice Bear can neither confirm nor deny that Ice Bear is in this picture."

Don't worry about it. I should thank you for the bit of Harry Potter trivia.

"Polynectar"... So, that's what they went with for "Polyjuice Potion." It does make it sound more appealing.

Wait, which theme is that?

@purplepumpkin, you've fallen for one of the classic blunders. Infinity isn't a number, it's a concept.
@timebender25, I must commend you on your use of the Poincaré recurrence time. Nothing less from a bender of time. However, there are larger numbers still. Even so, I give you a B+.

Oh, you like math? What's the biggest number then?

Fate/Grand Order. It's a mobile game based on the Fate franchise.