it was well-animated, yeah, but the comedy was a tad too awkwardly timed. you should focus on the timing and the delivery a little better. the characters move very rigid and all, but i can chalk that up to style and ignore it. i still think you could have made this joke work far better had something entirely unexpected happen than a "oh look he's drinking piss" thing. for example, have the character react with "fucking lord my piss tastes like piss!". it is a complete irony and entirely unexpected based on the content presented, and it would have been quite a lot funnier imo.
but all things considered, you did a good job =)