You found Kaga annoying. He kept trying to talk to you but you always either ignored him or gave him a shake of a head so he'd leave you alone. This time, he was rambling to you about some science experiment he was doing.

"It'll be splendid! The best invention I've ever made!"

He exclaimed, with his manic grin, followed by maniacal laughter, but you used your hand and covered his mouth before he could say anything else. The only thing you said was a small "Okay." He then pushed your hand away but kept quiet for a moment. With a mockingly sweet smile, he continued,

"Y'know, Potassium is a very nice element! It's very reactive. Unlike that response you just gave."

He says, with that sickeningly sweet tone,