Cancel history?

I'm still clueless. A couple of days ago, I saw a guy who had this patch sewn over the EASTPAK-label on his bag that said: "Cancel history, stop hatred".

Are you sure you want to cancel history?

As research has revealed, the patch is issued by a renowned snowboarding and skating equipment company. That's fine and it explains the "stop hatred"-part. But, what on earth does "cancel history" mean? I mean, cancel history? How the hell do I cancel history?