A reference to Will Wood and the Tapeworms second record, SELF-iSH. The second track, 2012, is about how his drug addiction caused him to forget the entirety of the year 2012. Forgetting 2012 references ones descent into drug addiction.
"I took pills with Jonathan today"
"Cool, just be careful not to forget 2012"
Something not everybody does, no matter how much they're encouraged to.
The reason tomorrow is just another game to change for him/her is that he/she wants people to forget the who, what, where, when, and why of what happened today (because he/she thinks it's a game to everyone involved). If you go back far enough, he/she wants you to forget what he/she was really like as a kid, versus his/her image today, despite him/her always telling people to be themselves.
To not remember
person 1: What's the term for not remembering?
person 2: shit! i always forget...