if you go back in time to kill your grandpa but then you wouldnt exist so you cant kill your grandpa since you dont exist but since you didnt kill your grandpa soyou exist now and you can kill your grandpa but then you wouldnt exist so you cant kill your grandpa since you dont exist but since you didnt kill your grandpa soyou exist now and you can kill your grandpa but then you wouldnt exist so you cant kill your grandpa since you dont exist but since you didnt kill your grandpa soyou exist now and you can kill your grandpa but then you wouldnt exist so you cant kill your grandpa since you dont exist but since you didnt kill your grandpa soyou exist now and you can kill your grandpa but then you wouldnt exist so you cant kill your grandpa since you dont exist but since you didnt kill your grandpa soyou exist now and you can kill your grandpa but then you wouldnt exist so you cant kill your grandpa since you dont exist but since you didnt kill your grandpa soyou exist now and you can kill your grandpa but then you wouldnt exist so you cant kill your grandpa since you dont exist but since you didnt kill your grandpa soyou exist now and you can kill your grandpa but then you wouldnt exist so you cant kill your grandpa since you dont exist but since you didnt kill your grandpa soyou exist now and you can kill your grandpa but then you wouldnt exist so you cant kill your grandpa since you dont exist but since you didnt kill your grandpa soyou exist now and you can kill your grandpa but then you wouldnt exist so you cant kill your grandpa since you dont exist but since you didnt kill your grandpa soyou exist now and you can kill your grandpa but then you wouldnt exist so you cant kill your grandpa since you dont exist but since you didnt kill your grandpa soyou exist now and you can kill your grandpa but then you wouldnt exist so you cant kill your grandpa since you dont exist but since you didnt kill your grandpa soyou exist now and you can kill your grandpa but then you wouldnt exist so you cant kill your grandpa since you dont exist but since you didnt kill your grandpa soyou exist now and you can....etc