Knowledge: Manta rays mostly like to Sunbathe. In addition, manta rays love to eat shrimp.

Conversation:
My brother recently went on vacation and said he saw a manta ray when he was on a boat in the ocean.
Really? They are large rays belonging to the Genus Manta.
I don't know much about them, but he did say they are large. Do you know if they sting?
No, I don't, but Black Manta is a fictional supervillain appearing in American comic books.
Hmmm interesting. Do you know anything else about manta rays? What do they eat?
They eat whatever they find under the water.
Hmm I see. I wanted to provide some food. Do you know what manta rays enjoy eating the most?

Response: Oh yeah, they like shrimp the most.