We explain the idiom" living under a rock".
You have been living under a rock if you didn't know The Vocab Man. (I'm just kidding)

More examples:

JAMES, an enthusiastic pop culture fanatic, sits on the couch, surrounded by posters and action figures. EMILY, his friend, enters the room, holding a tablet.
EMILY
Hey, James! Have you heard about that new superhero movie?
JAMES
(looking perplexed)
What superhero movie?
EMILY
(confused)
Are you living under a rock? It's been all over the news and social media for weeks!
JAMES
(defensively)
Hey, I'm not living under a rock. I just haven't had time to catch up on the latest news.
EMILY
(raising an eyebrow)
Sure, James. Just like when you didn't know who won the World Cup last year?
JAMES
(smirking)
Okay, that time I might have been living under a rock. But not this time!
EMILY
(laughing)
Alright, I'll fill you in. It's about a group of superheroes saving the world from an alien invasion.
JAMES
(excited)
Wow! That sounds awesome! I need to get out from under this rock more often!
They both share a laugh as James grabs the tablet to catch up on the superhero movie buzz.