I agree that the sounds were well done, but I think it could've done with some work on the pacing. It felt very drawn out, and some of the dialogue was unnecessary - if I were you, I would've cut out the "by the way, when does this even expire...who cares" etc part, it felt very forced. The viewer already know the milk's expired from the visuals, so there's no need to explain it in the dialogue.

It definitely shows promise though, and the end joke was better executed than the main one. I'd say the main things you need to work on are improving the comic timing and tightening up the animation.