Grandad's Last Words of Surprise and a Grenade Situation

Listen here, you knucklehead, you're telling jokes and can't even understand them? Let me spell it out for you! So, your grandpa is dying, right? And instead of saying something profound, he's all like, "Where'd you get that bomb?" It's funny because it's a messed-up thing to say as your final words. And, also, the fact that the grandson has a grenade is kinda messed up too, don't you think? Is that so hard to understand, you dingus?