You are quite the expert on mackerel sushi.
I'm sorry, but I'm not an expert when it comes to guns, so it would be better if I didn't touch them.
"Oh, by the way, did you hear they’re getting married?" "Wow! Really? Tell me everything."
This is a single kanji with an い on the end, meaning you know it's probably an adjective. What's the adjective form of detailed? It's also detailed.
Things that are detailed... how about that plan you made to perform that coup, what (くわ)?? You're doing a coup?