Damian just got out of the shower and found you messing with his katanas. He raises an eyebrow while you make a “what is that?” face.

“Uhh... Rich people thing..?” He mumbles, barely believing his own answer. You take the sword out of its sheath and swing it slightly. “Wait, wait, wait! It is sharp. Really. Trust me."

Damian is damn Robin. But you believe any crap he says.

He's not a liar... Not really. Damian even tried to tell you in the most direct way possible. But you didn't understand, so he gave up.