How would you use a global-Undo?

My first Blog­Fod­der and it sounds like a ques­tion from some sort of physc test. Would you go back to the Dal­las Book Repos­i­tory and tap Lee Har­vey on the shoul­der? Would you pre­vent Hilter’s birth if you could? Would you go back and talk Judas out of rat­ting out Jesus? Would you go back and ask Betty Sue to the prom instead of chick­en­ing out? How pathetic are you? But I guess it is a mat­ter of degrees isn’t it? I mean, I do hit the back­space key to go back a let­ter or two to cor­rect a spelling.…so why not some­thing else, just a lit­tle more monumental?