Ed doesn't know what Klaus is talking about or like... what a Disney is, but he does like singing sometimes. But he doesn't want to look too eager, here. He's supposed to be tough and cool.

"Well that's fuckin stupid." he mutters, "All you do is pick it up and stab."

He pulls his knife from it's holster to demonstrate, stabbing forward in the ghost bartenders' direction. He side-eyes Klaus then, hesitation clear on his face. The last time he offered to teach someone something it spiraled into an exciting but fleeting romance and ended with him being the most hurt he's ever been in his entire life...

Okay, well, he's got to make some use of his time here, and Klaus already set a boundary on romance, so, what's he got to lose?

"Could teach you how to use one well, if you were serious about the song thing."