Perhaps this will enlighten you:
https://www.youtube.com/watch?v=3ZVwFa-Fz5Q

And in case you don't feel like watching that: It's a meme harkening back to the stupidity displayed on a well known tumblr post, one of the many displays of which was somebody insisting 2 was odd.

Also see this Ace Attorney version, which is hilarious and the first place I'd heard of it:
https://www.youtube.com/watch?v=IFcyYnUHVBA