Cancer Talking

When someone that is diagnosed starts to be nice to others or acts way out of character because they know (or think) they are going to die...

Guy with Cancer: Sniff...Sniff... and you Billy! I was such an asshole! I am SOOOOOOO SORRY MAN!
Billy: It's OK man... it's OK man...
Frank: (Whispers) wow... what a change of heart eh?
Bill: (Whispers) yeah... that's the cancer talking...