Doesn't know either

At the homebrewer's meeting, Max tries to figure out what's wrong with his beer.

Max: I'll go and ask the guy over there what could have been gone wrong with our beer.

Max: What could have caused the off flavor in this beer?

Home brewer: Let me try the beer.

Home brewer: Yes, something is off. Make sure you properly calibrate all equipment and tools.

Home brewer: Exercise all vital measures thoroughly. Adopt proper brewing techniques.

Home brewer: I'd also recommend you keep good notes and ensure your gear is up to date.

Paul: And?

Max: He doesn't know either...