Aye, 'tis an old meme, but we're in Japan. They have their own culture of the Internet, so I know not if Rickroll has been a mainstream thing in here as it has in America.

Of course, I can always go with something more modern and obscure, yet it's considered particularly annoying in this location.

[He makes a quick search on his phone, and changes the song to this. And indeed, he mimicks the imaginary objects.]

♫ I have a pen
I have an apple
Uuuuuh
Apple pen! ♬