I am Error Puns

Hello,

I am requesting help with remembering a joke. Posts of this type did not seem to be against the subreddit's rules, but if I am in error, please let me know and delete my post.

Anyway, here is what I remember of the joke:

It is movie themed and it says something like this: "There should be a post-apocalyptic zombie movie with a romantic comedy element. Then we would have the world's first rom-com-zom-dom-bomb." The only thing is that I forget what the "dom" was supposed to mean and whether or not there is more to this joke, either in the set-up or the punchline. I googled it to no avail. Any help is appreciated.

Thank you

Sorry if format error. Am on mobile. Just wanted to share my favorite dad joke from my childhood. I think it was my dad's favorite joke to tell too. "There was a carrot walking along the road when he got hit by a car. He was rushed to the carrot hospital and looked at by the carrot doctors. When his carrot mom came to visit the doctor told her he had some good news and some bad news. >cm: What is the news carrot doctor? >cd: Well, the good news is he is alive. The bad news is he's going to be a vegetable for the rest of his life.